Re: [RBW] FSA Metropolis 2-Speed Interal-Geared Crankset
Eric: It could occur accidentally; I'm more curious to understand the sheer physics/mechanics of it, but you're right from a behavioral perspective it's less likely to happen in a typical riding situation. (Pssst, Philip... don't let that dissuade you from attempting your experiment... :) Bobby Long as it ain't MY hub Birmingham On Thursday, October 18, 2012 12:41:18 AM UTC-4, Eric Norris wrote: If you're talking about the S3X hub, then the answer is yes--If you're riding in cruising (3rd) gear at a reasonable speed and downshift on the fly to 2nd gear, your cadence immediately increases. Basically the same as downshifting a manual transmission car--the engine revs up in the lower gear to catch up with the speed of the car. It's not quite the same as shifting a standard (freewheeling) IGH, where the ability to coast hides the abruptness of the shift. Question is why you would downshift like that ... In my experience, the only time you'll need to downshift an S3X is because you're going slow and/or approaching an incline. Shifting to a lower gear at speed on the flats wouldn't make any sense. --Eric On Oct 17, 2012, at 9:27 PM, Montclair BobbyB montcla...@gmail.comjavascript: wrote: Philip: I'm curious... When you're flying along at a pretty good clip (in 3rd gear, fixie mode) and you're wheel is spinning at, say 120+ rpm, and you downshift to second gear, does your cadence abruptly accelerate to the point of wanting to toss you over the bars, or is it relatively smooth? I would think that might put an awful strain on the internal gearing... What's it like? (I submitted a question to Sam Patterson, developer of the Metropolis crankset, asking whether I can ride it in fixie mode... haven't received his reply yet.) BB -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To view this discussion on the web visit https://groups.google.com/d/msg/rbw-owners-bunch/-/fyI4F4THL7IJ. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
Re: [RBW] FSA Metropolis 2-Speed Interal-Geared Crankset
To yank this thread into the really weird: years ago I saw a description and photo of a -- what to call it? Derailleur multispeed non-coasting drivetrain? You couldn't call it fixed since it involved no fixed cog, only freewheels. I've been tempted to build one just for the over-the-top weirdness of it: on the level of that famous Polish straight block and do we mean straight block freewheel. IIRC, this was a standard, multispeed drivetrain on the right with two rings and as many cogs as you like, but with an added single ring and single cog reverse freewheel -- ie, it freewheeled as the pedals were rotated forward -- on the left. Since the right cogset was freewheeling, you could shift gears as usual, but the left drivetrain/freewheel prevented you from coasting because forward motion activated this drivetrain. The relevant point: I always suspected that, if you backed off pedaling in a high gear, that the pedals would immediately start spinning madly if the ratio of the left drivetrain was very low. On Thu, Oct 18, 2012 at 7:23 AM, Montclair BobbyB montclairbob...@gmail.com wrote: Eric: It could occur accidentally; I'm more curious to understand the sheer physics/mechanics of it, but you're right from a behavioral perspective it's less likely to happen in a typical riding situation. (Pssst, Philip... don't let that dissuade you from attempting your experiment... :) Bobby Long as it ain't MY hub Birmingham -- Vote early, vote often, vote Rhinoceros! http://tinyurl.com/d7muj2t - Patrick Moore, Albuquerque, NM, USA For professional resumes, contact Patrick Moore, ACRW http://resumespecialties.com/index.html - -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
Re: [RBW] FSA Metropolis 2-Speed Interal-Geared Crankset
If you're talking about the S3X hub, then the answer is yes--If you're riding in cruising (3rd) gear at a reasonable speed and downshift on the fly to 2nd gear, your cadence immediately increases. Basically the same as downshifting a manual transmission car--the engine revs up in the lower gear to catch up with the speed of the car. It's not quite the same as shifting a standard (freewheeling) IGH, where the ability to coast hides the abruptness of the shift. Question is why you would downshift like that ... In my experience, the only time you'll need to downshift an S3X is because you're going slow and/or approaching an incline. Shifting to a lower gear at speed on the flats wouldn't make any sense. --Eric On Oct 17, 2012, at 9:27 PM, Montclair BobbyB montclairbob...@gmail.com wrote: Philip: I'm curious... When you're flying along at a pretty good clip (in 3rd gear, fixie mode) and you're wheel is spinning at, say 120+ rpm, and you downshift to second gear, does your cadence abruptly accelerate to the point of wanting to toss you over the bars, or is it relatively smooth? I would think that might put an awful strain on the internal gearing... What's it like? (I submitted a question to Sam Patterson, developer of the Metropolis crankset, asking whether I can ride it in fixie mode... haven't received his reply yet.) BB -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
Re: [RBW] FSA Metropolis 2-Speed Interal-Geared Crankset
Well, on a freewheel geared bike I downshift before the hill starts so I have a rapid spin going into the incline. Joe Bernard Vallejo, CA. On Wednesday, October 17, 2012 9:41:18 PM UTC-7, Eric Norris wrote: If you're talking about the S3X hub, then the answer is yes--If you're riding in cruising (3rd) gear at a reasonable speed and downshift on the fly to 2nd gear, your cadence immediately increases. Basically the same as downshifting a manual transmission car--the engine revs up in the lower gear to catch up with the speed of the car. It's not quite the same as shifting a standard (freewheeling) IGH, where the ability to coast hides the abruptness of the shift. Question is why you would downshift like that ... In my experience, the only time you'll need to downshift an S3X is because you're going slow and/or approaching an incline. Shifting to a lower gear at speed on the flats wouldn't make any sense. --Eric On Oct 17, 2012, at 9:27 PM, Montclair BobbyB montcla...@gmail.comjavascript: wrote: Philip: I'm curious... When you're flying along at a pretty good clip (in 3rd gear, fixie mode) and you're wheel is spinning at, say 120+ rpm, and you downshift to second gear, does your cadence abruptly accelerate to the point of wanting to toss you over the bars, or is it relatively smooth? I would think that might put an awful strain on the internal gearing... What's it like? (I submitted a question to Sam Patterson, developer of the Metropolis crankset, asking whether I can ride it in fixie mode... haven't received his reply yet.) BB -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To view this discussion on the web visit https://groups.google.com/d/msg/rbw-owners-bunch/-/VxWyvKfTLD0J. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
[RBW] FSA Metropolis 2-Speed Interal-Geared Crankset
So I'm totally loving my SimpleOne... except that I live at the top of a big hill, and it's too heavy a gear to pedal up the hill. Then I saw one of those FSA Metropolis 2-speed cranks on eBay, and decided to try it out. Well, I gotta tell you, this thing just plain WORKS, and it WORKS WELL! It gives me a 28-tooth (direct) chainring for hills, and an effective 44-tooth chainring for flats and downhill. I use an old retro friction shifter, and the mechanism shifts effortlessly and instantaneously, even under load. Installation was straightforward and I encountered zero problems. The geared unit contains a heavy duty plastic tab that sits against the chainstay, preventing the gearing mechanism from turning. No ISG tab required, making the Metropolis compatible with virtually any bike (with a 68mm wide BB shell). The crank comes with external bearing bottom bracket; you provide the shifter. But virtually any shifter (that pulls cable) should work. I took it for a test ride... It feels great, and it really works well !!! I'm impressed; FSA could have a winner. Check out photos. http://tinyurl.com/9xhf462 Peace, BB -- You received this message because you are subscribed to the Google Groups RBW Owners Bunch group. To view this discussion on the web visit https://groups.google.com/d/msg/rbw-owners-bunch/-/_roT4P7ubQcJ. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
