Re: [RBW] Re: Broken Crank (Quickbeam)
thanks Bob, I was curious. While that is a high stress area, seems like there has to be something in the surface or microstructure producing a stress riser to get such a well-defined and straight crack origin. On Wednesday, May 6, 2015 at 11:26:16 AM UTC-5, Statrixbob wrote: On Thu, Apr 30, 2015 at 6:41 AM, Ron Mc bulld...@gmail.com javascript: wrote: Was the crack coincident with a stamped marking in the crank arm? I checked and no, there's no stamped marking on that part of the crank. Just one of those things. :-) Aloha, Bob -- Robert Harrison Honolulu, HI -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank (Quickbeam)
On Thu, Apr 30, 2015 at 6:41 AM, Ron Mc bulldog...@gmail.com wrote: Was the crack coincident with a stamped marking in the crank arm? I checked and no, there's no stamped marking on that part of the crank. Just one of those things. :-) Aloha, Bob -- Robert Harrison Honolulu, HI rfharri...@gmail.com statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank (Quickbeam)
On Thu, Apr 30, 2015 at 7:48 AM, Minh mgiangs...@gmail.com wrote: if you want to treat yourself i recently put on a White Industries crank that looks awesome. Which of their cranks did you use? What size BB? And, since you say it looks awesome, got an image? :-) Aloha, Bob -- Robert Harrison Honolulu, HI rfharri...@gmail.com statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank (Quickbeam)
I ran a Campy square taper crank with one 39t ring on the outer side of the crank with single ring bolts for a long time. The Campy 110 BB set up a perfect chainline. Recently switched to the VO with 44t ring and 115 BB which is a little inward. Michael -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
can't see your photos without a yahoo account. I think we're dealing with the biggest limitation of a square taper crank. The torque is going to gradually relax, and stresses become really high on the inside corner - the one that's loaded when you step on the crank. I had the same thing happen on a used TA5 - broke when I was taking off from a stoplight. http://img.photobucket.com/albums/v728/bulldog1935/Raleigh/700c/aP1207649.jpg http://img.photobucket.com/albums/v728/bulldog1935/Raleigh/700c/aP1207650.jpg -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
I'm glad you're OK, Bob! That was very good timing of it to break given some of the alternatives. I can't see your photos on Flickr as they are private. With abandon, Patrick -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
Bob, I am glad it was not a more catastrophic experience for you. All the best, Erl On Wednesday, April 29, 2015 at 11:52:15 PM UTC-4, Statrixbob wrote: First let me say...no injuries, no accident, didn't even fall over. Having said that, it was a bit unexpected and I'm terribly grateful it didn't happen this weekend when I rode the 2015 JBK Haleiwa Metric Century on my Quickbeam (and had a great time as documented in another email and at: http://www.statrix.com/2015/04/2015_jbk_ride_report/) Anyway, I left work today, hopped on my bike and was going to run a few errands and maybe put in an extra mile or two (and I do mean just a mile or two - but still fun, eh?) I was at a light and when stood and pushed off when the light turned green my foot sort of kept going to the ground. Luckily I didn't fall and stopped, though it probably looked clumsy. I couldn't figure out how I'd missed the pedal. I hadn't. My Sugino XD2-QB double 40/32 175mm and come undone. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ I didn't take an image in place. I got the hell off the road. :-) I bought the bike in December 2009 and have ridden the heck out of it. I've also mostly been a lot heavier than I am today (also documented in other emails around here). I've gone from 275 to 197, mostly since November 2014. If you do the math, the crank mostly got me at my heaviest. If you look at the break it seems pretty clear it'd been a while coming. There are definite differences from one side of the break to the other. As I said, I'm really just grateful that it didn't happen on the century this weekend, or in heaving traffic (could have too). It was pretty much a non-event. For those who wonder, I have a Hunq that'll be ridden a bit more now. If I'm annoyed with anything it's that I just, and I mean just, ordered some new cork grips from Riv and now will have to order a new crank - twice the shipping charge. If I'd have waited a day or two on the cork grips it could all be one box. Sigh. Luxury problem. Anyway I ride the bike almost exclusively in 42x16 mode and figure I'll get new chainrings and a new single speed cassette - all contingent on taking the chain off and actually seeing what things look like - I might be okay. As for the Hunq I just had a new dynohub wheel made for it and when I got home instead of playing around the with disassembly the QB I put on the new Eyc light, Top Line rear light, and wired it all up. Tomorrow I have a late ride 'date' and until now only the QB had that much light going for it. :-) Aloha, Bob -- Robert Harrison Honolulu, HI rfhar...@gmail.com javascript: statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
that's a really strange place to break. It cracked gradually from the inside. Was there any kind of stamped marking at the crack origin on the inside edge? On Thursday, April 30, 2015 at 9:56:15 AM UTC-5, Statrixbob wrote: Oops, I just made the photos public. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ Mea culpa and aloha! Bob On Apr 29, 2015 5:51 PM, Robert F. Harrison rfhar...@gmail.com javascript: wrote: First let me say...no injuries, no accident, didn't even fall over. Having said that, it was a bit unexpected and I'm terribly grateful it didn't happen this weekend when I rode the 2015 JBK Haleiwa Metric Century on my Quickbeam (and had a great time as documented in another email and at: http://www.statrix.com/2015/04/2015_jbk_ride_report/) Anyway, I left work today, hopped on my bike and was going to run a few errands and maybe put in an extra mile or two (and I do mean just a mile or two - but still fun, eh?) I was at a light and when stood and pushed off when the light turned green my foot sort of kept going to the ground. Luckily I didn't fall and stopped, though it probably looked clumsy. I couldn't figure out how I'd missed the pedal. I hadn't. My Sugino XD2-QB double 40/32 175mm and come undone. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ I didn't take an image in place. I got the hell off the road. :-) I bought the bike in December 2009 and have ridden the heck out of it. I've also mostly been a lot heavier than I am today (also documented in other emails around here). I've gone from 275 to 197, mostly since November 2014. If you do the math, the crank mostly got me at my heaviest. If you look at the break it seems pretty clear it'd been a while coming. There are definite differences from one side of the break to the other. As I said, I'm really just grateful that it didn't happen on the century this weekend, or in heaving traffic (could have too). It was pretty much a non-event. For those who wonder, I have a Hunq that'll be ridden a bit more now. If I'm annoyed with anything it's that I just, and I mean just, ordered some new cork grips from Riv and now will have to order a new crank - twice the shipping charge. If I'd have waited a day or two on the cork grips it could all be one box. Sigh. Luxury problem. Anyway I ride the bike almost exclusively in 42x16 mode and figure I'll get new chainrings and a new single speed cassette - all contingent on taking the chain off and actually seeing what things look like - I might be okay. As for the Hunq I just had a new dynohub wheel made for it and when I got home instead of playing around the with disassembly the QB I put on the new Eyc light, Top Line rear light, and wired it all up. Tomorrow I have a late ride 'date' and until now only the QB had that much light going for it. :-) Aloha, Bob -- Robert Harrison Honolulu, HI rfhar...@gmail.com javascript: statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
the worst part is there is really no sensible way to ride after that - luckily when mine happened, we were on our way downtown to the Frankenbike meet. Walked the bike 20 blocks and bought a $5 crank arm to get home. On Thursday, April 30, 2015 at 8:24:03 AM UTC-5, WETH wrote: Bob, I am glad it was not a more catastrophic experience for you. All the best, Erl On Wednesday, April 29, 2015 at 11:52:15 PM UTC-4, Statrixbob wrote: First let me say...no injuries, no accident, didn't even fall over. Having said that, it was a bit unexpected and I'm terribly grateful it didn't happen this weekend when I rode the 2015 JBK Haleiwa Metric Century on my Quickbeam (and had a great time as documented in another email and at: http://www.statrix.com/2015/04/2015_jbk_ride_report/) Anyway, I left work today, hopped on my bike and was going to run a few errands and maybe put in an extra mile or two (and I do mean just a mile or two - but still fun, eh?) I was at a light and when stood and pushed off when the light turned green my foot sort of kept going to the ground. Luckily I didn't fall and stopped, though it probably looked clumsy. I couldn't figure out how I'd missed the pedal. I hadn't. My Sugino XD2-QB double 40/32 175mm and come undone. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ I didn't take an image in place. I got the hell off the road. :-) I bought the bike in December 2009 and have ridden the heck out of it. I've also mostly been a lot heavier than I am today (also documented in other emails around here). I've gone from 275 to 197, mostly since November 2014. If you do the math, the crank mostly got me at my heaviest. If you look at the break it seems pretty clear it'd been a while coming. There are definite differences from one side of the break to the other. As I said, I'm really just grateful that it didn't happen on the century this weekend, or in heaving traffic (could have too). It was pretty much a non-event. For those who wonder, I have a Hunq that'll be ridden a bit more now. If I'm annoyed with anything it's that I just, and I mean just, ordered some new cork grips from Riv and now will have to order a new crank - twice the shipping charge. If I'd have waited a day or two on the cork grips it could all be one box. Sigh. Luxury problem. Anyway I ride the bike almost exclusively in 42x16 mode and figure I'll get new chainrings and a new single speed cassette - all contingent on taking the chain off and actually seeing what things look like - I might be okay. As for the Hunq I just had a new dynohub wheel made for it and when I got home instead of playing around the with disassembly the QB I put on the new Eyc light, Top Line rear light, and wired it all up. Tomorrow I have a late ride 'date' and until now only the QB had that much light going for it. :-) Aloha, Bob -- Robert Harrison Honolulu, HI rfhar...@gmail.com statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank (Quickbeam)
BUT http://img.photobucket.com/albums/v728/bulldog1935/Raleigh/Viner/cbe78ecd-0dea-4b21-90a4-d6a6cf894ff8.jpg Was the crack coincident with a stamped marking in the crank arm? On Thursday, April 30, 2015 at 11:10:10 AM UTC-5, Statrixbob wrote: On Thu, Apr 30, 2015 at 5:23 AM, Minh mgian...@gmail.com javascript: wrote: well count yourself lucky that it happened at a pretty innocuous time, imagine if this had happened while bombing down a hill!! and now consider replacement options As far as replacement options go I haven't had time to really take a look at everything yet. I really only ride in 40x16 so the only wear is likely to be there so I may be able to just replace the crankset and have it as is...or I can start getting creative. What are other folks running on their Quickbeam/Simpleones? Aloha -- Robert Harrison Honolulu, HI rfhar...@gmail.com javascript: statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank (Quickbeam)
I'm constantly struggling between treating myself or using something good enough. so i'm using the same model crank that you just broke! if you want to treat yourself i recently put on a White Industries crank that looks awesome. second hand i'm a big fan of the older suntour superbe pro cranks, but after your luck maybe a second hand crank is a bad idea On Thursday, April 30, 2015 at 12:10:10 PM UTC-4, Statrixbob wrote: On Thu, Apr 30, 2015 at 5:23 AM, Minh mgian...@gmail.com javascript: wrote: well count yourself lucky that it happened at a pretty innocuous time, imagine if this had happened while bombing down a hill!! and now consider replacement options As far as replacement options go I haven't had time to really take a look at everything yet. I really only ride in 40x16 so the only wear is likely to be there so I may be able to just replace the crankset and have it as is...or I can start getting creative. What are other folks running on their Quickbeam/Simpleones? Aloha -- Robert Harrison Honolulu, HI rfhar...@gmail.com javascript: statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank (Quickbeam)
I don't have access to the bike (rode my Hunq to work) so I can't take a look till tonight. I do not remember it being near a stamping, but I also don't remember what I had for lunch yesterday. :-) I'll check tonight. Bob On Thu, Apr 30, 2015 at 6:41 AM, Ron Mc bulldog...@gmail.com wrote: BUT http://img.photobucket.com/albums/v728/bulldog1935/Raleigh/Viner/cbe78ecd-0dea-4b21-90a4-d6a6cf894ff8.jpg Was the crack coincident with a stamped marking in the crank arm? On Thursday, April 30, 2015 at 11:10:10 AM UTC-5, Statrixbob wrote: On Thu, Apr 30, 2015 at 5:23 AM, Minh mgian...@gmail.com wrote: well count yourself lucky that it happened at a pretty innocuous time, imagine if this had happened while bombing down a hill!! and now consider replacement options As far as replacement options go I haven't had time to really take a look at everything yet. I really only ride in 40x16 so the only wear is likely to be there so I may be able to just replace the crankset and have it as is...or I can start getting creative. What are other folks running on their Quickbeam/Simpleones? Aloha -- Robert Harrison Honolulu, HI rfhar...@gmail.com statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout. -- Robert Harrison Honolulu, HI rfharri...@gmail.com statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
Yikes! That's disconcerting! I'm certainly glad you weren't hurt! On Thursday, April 30, 2015 at 9:56:15 AM UTC-5, Statrixbob wrote: Oops, I just made the photos public. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ Mea culpa and aloha! Bob On Apr 29, 2015 5:51 PM, Robert F. Harrison rfhar...@gmail.com javascript: wrote: First let me say...no injuries, no accident, didn't even fall over. Having said that, it was a bit unexpected and I'm terribly grateful it didn't happen this weekend when I rode the 2015 JBK Haleiwa Metric Century on my Quickbeam (and had a great time as documented in another email and at: http://www.statrix.com/2015/04/2015_jbk_ride_report/) Anyway, I left work today, hopped on my bike and was going to run a few errands and maybe put in an extra mile or two (and I do mean just a mile or two - but still fun, eh?) I was at a light and when stood and pushed off when the light turned green my foot sort of kept going to the ground. Luckily I didn't fall and stopped, though it probably looked clumsy. I couldn't figure out how I'd missed the pedal. I hadn't. My Sugino XD2-QB double 40/32 175mm and come undone. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ I didn't take an image in place. I got the hell off the road. :-) I bought the bike in December 2009 and have ridden the heck out of it. I've also mostly been a lot heavier than I am today (also documented in other emails around here). I've gone from 275 to 197, mostly since November 2014. If you do the math, the crank mostly got me at my heaviest. If you look at the break it seems pretty clear it'd been a while coming. There are definite differences from one side of the break to the other. As I said, I'm really just grateful that it didn't happen on the century this weekend, or in heaving traffic (could have too). It was pretty much a non-event. For those who wonder, I have a Hunq that'll be ridden a bit more now. If I'm annoyed with anything it's that I just, and I mean just, ordered some new cork grips from Riv and now will have to order a new crank - twice the shipping charge. If I'd have waited a day or two on the cork grips it could all be one box. Sigh. Luxury problem. Anyway I ride the bike almost exclusively in 42x16 mode and figure I'll get new chainrings and a new single speed cassette - all contingent on taking the chain off and actually seeing what things look like - I might be okay. As for the Hunq I just had a new dynohub wheel made for it and when I got home instead of playing around the with disassembly the QB I put on the new Eyc light, Top Line rear light, and wired it all up. Tomorrow I have a late ride 'date' and until now only the QB had that much light going for it. :-) Aloha, Bob -- Robert Harrison Honolulu, HI rfhar...@gmail.com javascript: statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank (Quickbeam)
I have older Shimano 600s with 39/42 rings on my Quickbeam. Philip www.biketinker.com On Thursday, April 30, 2015 at 9:10:10 AM UTC-7, Statrixbob wrote: On Thu, Apr 30, 2015 at 5:23 AM, Minh mgian...@gmail.com javascript: wrote: well count yourself lucky that it happened at a pretty innocuous time, imagine if this had happened while bombing down a hill!! and now consider replacement options As far as replacement options go I haven't had time to really take a look at everything yet. I really only ride in 40x16 so the only wear is likely to be there so I may be able to just replace the crankset and have it as is...or I can start getting creative. What are other folks running on their Quickbeam/Simpleones? Aloha -- Robert Harrison Honolulu, HI rfhar...@gmail.com javascript: statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
fwiw, the highest load you ever (always) put on a crank is when you stand on one side to take off. I know a lot of people lead with their right foot, but I do the left thing, too. In the taper area, right-side crank arms are usually stronger because there's more medal there. But that doesn't apply to where Bob's broke. On Thursday, April 30, 2015 at 2:44:38 PM UTC-5, Ryan Fleming wrote: Yikes! That's disconcerting! I'm certainly glad you weren't hurt! On Thursday, April 30, 2015 at 9:56:15 AM UTC-5, Statrixbob wrote: Oops, I just made the photos public. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ Mea culpa and aloha! Bob On Apr 29, 2015 5:51 PM, Robert F. Harrison rfhar...@gmail.com wrote: First let me say...no injuries, no accident, didn't even fall over. Having said that, it was a bit unexpected and I'm terribly grateful it didn't happen this weekend when I rode the 2015 JBK Haleiwa Metric Century on my Quickbeam (and had a great time as documented in another email and at: http://www.statrix.com/2015/04/2015_jbk_ride_report/) Anyway, I left work today, hopped on my bike and was going to run a few errands and maybe put in an extra mile or two (and I do mean just a mile or two - but still fun, eh?) I was at a light and when stood and pushed off when the light turned green my foot sort of kept going to the ground. Luckily I didn't fall and stopped, though it probably looked clumsy. I couldn't figure out how I'd missed the pedal. I hadn't. My Sugino XD2-QB double 40/32 175mm and come undone. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ I didn't take an image in place. I got the hell off the road. :-) I bought the bike in December 2009 and have ridden the heck out of it. I've also mostly been a lot heavier than I am today (also documented in other emails around here). I've gone from 275 to 197, mostly since November 2014. If you do the math, the crank mostly got me at my heaviest. If you look at the break it seems pretty clear it'd been a while coming. There are definite differences from one side of the break to the other. As I said, I'm really just grateful that it didn't happen on the century this weekend, or in heaving traffic (could have too). It was pretty much a non-event. For those who wonder, I have a Hunq that'll be ridden a bit more now. If I'm annoyed with anything it's that I just, and I mean just, ordered some new cork grips from Riv and now will have to order a new crank - twice the shipping charge. If I'd have waited a day or two on the cork grips it could all be one box. Sigh. Luxury problem. Anyway I ride the bike almost exclusively in 42x16 mode and figure I'll get new chainrings and a new single speed cassette - all contingent on taking the chain off and actually seeing what things look like - I might be okay. As for the Hunq I just had a new dynohub wheel made for it and when I got home instead of playing around the with disassembly the QB I put on the new Eyc light, Top Line rear light, and wired it all up. Tomorrow I have a late ride 'date' and until now only the QB had that much light going for it. :-) Aloha, Bob -- Robert Harrison Honolulu, HI rfhar...@gmail.com statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
Bob, I am glad you didn't get hurt! Let the folks at RBW know, as I think at least Grant Petersen would want to see the crank. Seems like he has a great love for Sugino cranks and I think he would be interested. I need to remember to check my cranks from time to time. Congrats on the metric century, by the way! Looked like a day of fun riding in beautiful surroundings! I can't recommend cranks because I don't know from single speeds. But in general, I know Sugino cranks are great, and the new Rene Herse cranks look interesting with their same bcd size for all rings, even on their triples, and ring replaceability without needing to remove the crank arm. Cool feature. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
hmm agree with Ron, not the place i would've guessed for a break before seeing the pictures. for a break like that, maybe it was it from the side and started to crack, crack, crack. it's a pretty straight/clean break! well count yourself lucky that it happened at a pretty innocuous time, imagine if this had happened while bombing down a hill!! and now consider replacement options On Thursday, April 30, 2015 at 11:04:23 AM UTC-4, Ron Mc wrote: that's a really strange place to break. It cracked gradually from the inside. Was there any kind of stamped marking at the crack origin on the inside edge? On Thursday, April 30, 2015 at 9:56:15 AM UTC-5, Statrixbob wrote: Oops, I just made the photos public. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ Mea culpa and aloha! Bob -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
I wonder if the crank had been subjected to a side force, like being dropped onto the pedal? On Thursday, April 30, 2015 at 8:04:23 AM UTC-7, Ron Mc wrote: that's a really strange place to break. It cracked gradually from the inside. Was there any kind of stamped marking at the crack origin on the inside edge? On Thursday, April 30, 2015 at 9:56:15 AM UTC-5, Statrixbob wrote: Oops, I just made the photos public. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ Mea culpa and aloha! Bob -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank (Quickbeam)
Oops, I just made the photos public. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ Mea culpa and aloha! Bob On Apr 29, 2015 5:51 PM, Robert F. Harrison rfharri...@gmail.com wrote: First let me say...no injuries, no accident, didn't even fall over. Having said that, it was a bit unexpected and I'm terribly grateful it didn't happen this weekend when I rode the 2015 JBK Haleiwa Metric Century on my Quickbeam (and had a great time as documented in another email and at: http://www.statrix.com/2015/04/2015_jbk_ride_report/) Anyway, I left work today, hopped on my bike and was going to run a few errands and maybe put in an extra mile or two (and I do mean just a mile or two - but still fun, eh?) I was at a light and when stood and pushed off when the light turned green my foot sort of kept going to the ground. Luckily I didn't fall and stopped, though it probably looked clumsy. I couldn't figure out how I'd missed the pedal. I hadn't. My Sugino XD2-QB double 40/32 175mm and come undone. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ I didn't take an image in place. I got the hell off the road. :-) I bought the bike in December 2009 and have ridden the heck out of it. I've also mostly been a lot heavier than I am today (also documented in other emails around here). I've gone from 275 to 197, mostly since November 2014. If you do the math, the crank mostly got me at my heaviest. If you look at the break it seems pretty clear it'd been a while coming. There are definite differences from one side of the break to the other. As I said, I'm really just grateful that it didn't happen on the century this weekend, or in heaving traffic (could have too). It was pretty much a non-event. For those who wonder, I have a Hunq that'll be ridden a bit more now. If I'm annoyed with anything it's that I just, and I mean just, ordered some new cork grips from Riv and now will have to order a new crank - twice the shipping charge. If I'd have waited a day or two on the cork grips it could all be one box. Sigh. Luxury problem. Anyway I ride the bike almost exclusively in 42x16 mode and figure I'll get new chainrings and a new single speed cassette - all contingent on taking the chain off and actually seeing what things look like - I might be okay. As for the Hunq I just had a new dynohub wheel made for it and when I got home instead of playing around the with disassembly the QB I put on the new Eyc light, Top Line rear light, and wired it all up. Tomorrow I have a late ride 'date' and until now only the QB had that much light going for it. :-) Aloha, Bob -- Robert Harrison Honolulu, HI rfharri...@gmail.com statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank (Quickbeam)
As far as I know it's never been dropped onto the pedals. And as far as I recall, the only time I've ever fallen over on that bike it was on the left side, not the right, and it was (embarrassingly) while I was stopped and tried to turn to talk with someone and got tangled and, well, never mind. :-) Aloha, Bob On Thu, Apr 30, 2015 at 5:19 AM, BSWP ashtab...@gmail.com wrote: I wonder if the crank had been subjected to a side force, like being dropped onto the pedal? On Thursday, April 30, 2015 at 8:04:23 AM UTC-7, Ron Mc wrote: that's a really strange place to break. It cracked gradually from the inside. Was there any kind of stamped marking at the crack origin on the inside edge? On Thursday, April 30, 2015 at 9:56:15 AM UTC-5, Statrixbob wrote: Oops, I just made the photos public. https://www.flickr.com/photos/mgps-bob/sets/72157652254822642/ Mea culpa and aloha! Bob -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout. -- Robert Harrison Honolulu, HI rfharri...@gmail.com statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank (Quickbeam)
On Thu, Apr 30, 2015 at 5:23 AM, Minh mgiangs...@gmail.com wrote: well count yourself lucky that it happened at a pretty innocuous time, imagine if this had happened while bombing down a hill!! and now consider replacement options As far as replacement options go I haven't had time to really take a look at everything yet. I really only ride in 40x16 so the only wear is likely to be there so I may be able to just replace the crankset and have it as is...or I can start getting creative. What are other folks running on their Quickbeam/Simpleones? Aloha -- Robert Harrison Honolulu, HI rfharri...@gmail.com statrix.com Wu Name: Tha Eurythmic King of Nowhere -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank
On Sat, Feb 14, 2015 at 10:34 PM, Benedikt neutralbuoya...@comcast.net wrote: I added a few pictures for those of you who wanted to see the other side of the crank including some mating the two up. https://www.flickr.com/photos/neutralbuoyancy/16529273621/in/album-72157607896493013/ - Brian Thanks, that was very helpful. It didn't look like I thought it would at all, judging from the first photos - I thought the big gentle inner curve was a flat machined surface. Even if there's a gentle curve, the very transition to the arm is abrupt and sharp, and it's a definitive stress riser. And the crack started exactly there. Even so, I would not say it's a poor design - it could improve in that detail to have more margin of error, but it's likely a materials problem in manufacturing. I have decades of experience with dogsled runners made of 7075 aluminium, and they are subject to an extreme amount of flex and corrosion compared to a bicycle crank, and they mostly break because of severe mechanical damages and cut-outs that initiates the break. I don't know how the original French cranks were shaped there, I use an old Stronglight 49A crank myself daily in summertime but the bike is in storage now and I can't take a look. Johan Larsson, Sweden -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank
Does anyone make quality steel cranks? Seems like a perfect Riv project. On Sat, Feb 14, 2015 at 1:34 PM, Benedikt neutralbuoya...@comcast.net wrote: I added a few pictures for those of you who wanted to see the other side of the crank including some mating the two up. https://www.flickr.com/photos/neutralbuoyancy/16529273621/in/album-72157607896493013/ - Brian On Thursday, February 12, 2015 at 12:31:07 AM UTC-8, Benedikt wrote: I seem to remember seeing a similar post to this a few weeks/months ago but here it is ... My VO crank that had 13,000 miles on it busted this morning on my way into work. I was at a stop. Pushed down with my right foot, locked my left clip in, pushed down with the right and clunk crank arm came right off. Fortunately I wasn't going that fast, hammering down the road. What causes this? Do ALL cranks have a life span? These are an aluminum alloy. Here's a pretty good picture of the break - https://www.flickr.com/photos/neutralbuoyancy/16320815710/ - Brian in Seattle -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout. -- -Zack -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank
I'm curious about how the backside of the arm looks at the crack, the side that is towards the table on the pictures. It's not possible to see the radius of the inner corner otherwise. Johan Larsson, Sweden -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank
Kudos to VO for sending a replacement, but I think that should be the appropriate response from any manufacturer when a product fails prematurely. Did they mention anything else in their response? Such as a history of the particular crank failing or that they changed tooling due to these stress points? It is nice that you'll have a replacement, but I'd be wary of a product that has failed. While you didn't get hurt this time, whose to say the replacement won't fail as well, and could have more damaging results. Just being a skeptic this morning. David Chicago On Thursday, February 12, 2015 at 9:17:35 PM UTC-6, Benedikt wrote: Actually I sent VO an email with a picture of the crank. There response was,What address do you want us to send your new replacement crank? -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank
That radius cut ends right where the crack begins which is what I'd expect. That radius is there to relieve stress. Maybe a larger radius would help. Im more heavy duty applications, that area would be shot peened to relieve more stress. Glad that it happened at a red light and that VO is giving you great service. On Thursday, February 12, 2015 at 2:31:07 AM UTC-6, Benedikt wrote: I seem to remember seeing a similar post to this a few weeks/months ago but here it is ... My VO crank that had 13,000 miles on it busted this morning on my way into work. I was at a stop. Pushed down with my right foot, locked my left clip in, pushed down with the right and clunk crank arm came right off. Fortunately I wasn't going that fast, hammering down the road. What causes this? Do ALL cranks have a life span? These are an aluminum alloy. Here's a pretty good picture of the break - https://www.flickr.com/photos/neutralbuoyancy/16320815710/ - Brian in Seattle -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
Re: [RBW] Re: Broken Crank
David, VO said they'd never seen anything like that before. On Feb 14, 2015 7:25 AM, David Banzer daban...@gmail.com wrote: Kudos to VO for sending a replacement, but I think that should be the appropriate response from any manufacturer when a product fails prematurely. Did they mention anything else in their response? Such as a history of the particular crank failing or that they changed tooling due to these stress points? It is nice that you'll have a replacement, but I'd be wary of a product that has failed. While you didn't get hurt this time, whose to say the replacement won't fail as well, and could have more damaging results. Just being a skeptic this morning. David Chicago On Thursday, February 12, 2015 at 9:17:35 PM UTC-6, Benedikt wrote: Actually I sent VO an email with a picture of the crank. There response was,What address do you want us to send your new replacement crank? -- You received this message because you are subscribed to a topic in the Google Groups RBW Owners Bunch group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/rbw-owners-bunch/Nf6eZKG4O3E/unsubscribe . To unsubscribe from this group and all its topics, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank
I added a few pictures for those of you who wanted to see the other side of the crank including some mating the two up. https://www.flickr.com/photos/neutralbuoyancy/16529273621/in/album-72157607896493013/ - Brian On Thursday, February 12, 2015 at 12:31:07 AM UTC-8, Benedikt wrote: I seem to remember seeing a similar post to this a few weeks/months ago but here it is ... My VO crank that had 13,000 miles on it busted this morning on my way into work. I was at a stop. Pushed down with my right foot, locked my left clip in, pushed down with the right and clunk crank arm came right off. Fortunately I wasn't going that fast, hammering down the road. What causes this? Do ALL cranks have a life span? These are an aluminum alloy. Here's a pretty good picture of the break - https://www.flickr.com/photos/neutralbuoyancy/16320815710/ - Brian in Seattle -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank
Tank you Wes Ramos and Deacon Patrick. Those are exactly the sort of answers I was looking for. Wes, the article you linked to was great. I was wondering about that discoloration. Obviously there was a crack for some time slowly growing. Weather it is a flaw in manufacturing I don't know but since VO is willing to send a free replacement, I'm willing to give them a second chance. -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank
Thinking back over the last 6 months or so I do seem to remember an occasional tink sort of sound and feel in the downward stroke of the right crank. Could this have been a tell tale sign of the crank cracking ever so little bit more? I couldn't think of anything else in that area of the drive train that would cause this. Bottom bracket, chain ring bolts, etc. were all buttoned up nice tidy. On Thursday, February 12, 2015 at 12:31:07 AM UTC-8, Benedikt wrote: I seem to remember seeing a similar post to this a few weeks/months ago but here it is ... My VO crank that had 13,000 miles on it busted this morning on my way into work. I was at a stop. Pushed down with my right foot, locked my left clip in, pushed down with the right and clunk crank arm came right off. Fortunately I wasn't going that fast, hammering down the road. What causes this? Do ALL cranks have a life span? These are an aluminum alloy. Here's a pretty good picture of the break - https://www.flickr.com/photos/neutralbuoyancy/16320815710/ - Brian in Seattle -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank
I'll betcha that was it. It's a bummer that it snapped, but very cool of VO to send you a new one. On Friday, February 13, 2015 at 9:30:18 PM UTC-8, Benedikt wrote: Thinking back over the last 6 months or so I do seem to remember an occasional tink sort of sound and feel in the downward stroke of the right crank. Could this have been a tell tale sign of the crank cracking ever so little bit more? I couldn't think of anything else in that area of the drive train that would cause this. Bottom bracket, chain ring bolts, etc. were all buttoned up nice tidy. On Thursday, February 12, 2015 at 12:31:07 AM UTC-8, Benedikt wrote: I seem to remember seeing a similar post to this a few weeks/months ago but here it is ... My VO crank that had 13,000 miles on it busted this morning on my way into work. I was at a stop. Pushed down with my right foot, locked my left clip in, pushed down with the right and clunk crank arm came right off. Fortunately I wasn't going that fast, hammering down the road. What causes this? Do ALL cranks have a life span? These are an aluminum alloy. Here's a pretty good picture of the break - https://www.flickr.com/photos/neutralbuoyancy/16320815710/ - Brian in Seattle -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Broken Crank
This is a classic fatigue failure -- looks like a fracture had existed for a while before it sheared off. There's a small write up in RR42 about the exact same failure (and location, probably safe to say this one of the highest stress areas in a crank arm). http://www.cyclofiend.com/Images/pdf/RR42_web.pdf see page 7 As far as prevention, a better alloy (steel) will allow more load cycles. Aluminum alloys can take a magnitude less cycles before failure, but mostly dependent on composition, load environments etc. As far as shear failure prevention after crack initiation, could have run an NDT inspection and seen the crack... however this is not economic on bike parts. On Thursday, February 12, 2015 at 2:31:07 AM UTC-6, Benedikt wrote: I seem to remember seeing a similar post to this a few weeks/months ago but here it is ... My VO crank that had 13,000 miles on it busted this morning on my way into work. I was at a stop. Pushed down with my right foot, locked my left clip in, pushed down with the right and clunk crank arm came right off. Fortunately I wasn't going that fast, hammering down the road. What causes this? Do ALL cranks have a life span? These are an aluminum alloy. Here's a pretty good picture of the break - https://www.flickr.com/photos/neutralbuoyancy/16320815710/ - Brian in Seattle -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
