I already decided that I don't like the current TA 180s on my Riv. I was going to try to live with them (see Kneesavers thread) but I think I would prefer to reclaim some ground clearance now that I've seen how low it is.
I do like the 175s on my Paul Taylor so my thinking is maybe it's another 5mm in the right direction? And I reclaim a full centimeter of ground clearance. Or I could just get 175s, I'm looking at some Sugino XD600 46-36-26 and the vendor I'm looking at has both 170 and 175. On Thu, Nov 14, 2013 at 11:41 AM, Bill Lindsay <tapebu...@gmail.com> wrote: > Do what feels right to you regarding crank arm length. I am one of those > people who would never change crankarm length. I think running shorter > cranks to solve pedal strike issues makes as much sense as squeezing your > feet into smaller shoes to solve toe clip overlap. > > Many other people who are much more experienced than me believe that crank > arm length doesn't matter much and that 5mm or even 10mm changes are hard > to detect and if detected are easy to grow accustomed to. Again, do > whatever feels right to you. > > > On Thursday, November 14, 2013 9:32:37 AM UTC-8, Jim Bronson wrote: > >> The wildcard I didn't mention was the 700x32 tires barely cleared the old >> brakes, Tektro RX40 short reach. I installed the Tektro R559 and the 650B >> wheels the other night and rode it yesterday with Nifty Swifty 650Bx32.8. >> >> There may actually be better clearance under the R559 just given that >> they have a way more optimal shape for big tires and fenders. I don't >> really know how you calculate for that, but anyway I am starting to feel >> better about this conversion. I'm planning on acquiring the 42mm tires and >> shortening my cranks to 170. That should put me right about where I >> started with the 700c wheels as far as clearance goes. >> >> >> >> >> On Thu, Nov 14, 2013 at 10:51 AM, Bill Lindsay <tape...@gmail.com> wrote: >> >>> Jim >>> >>> Yes, you should be able to do that. Steve got the rim part right, but >>> the tire part has a small mistake. You don't half the tire width for this >>> calculation. >>> >>> Your existing 700x32 wheel, which barely clears the brake bridge is >>> (622/2)+32 = 343mm in radius and barely clears the brake bridge >>> Your 650bx42 will be (584/2)+42 = 334mm in radius. You will have 9mm of >>> additional clearance under the brake bridge, with Hetres. >>> That same 9mm is what you use for estimating your change in BB height. >>> Your bike will be 9mm lower to the ground when you go from 700x32 to >>> 650x42. Additional tire deflection when you get on the bike might be worth >>> considering, as well, but that 9mm is a good start. >>> >>> You use the full tire width when estimating wheel radius, not half the >>> tire width, as Steve indicated above. You would take half the difference >>> in tire width when you look at the sideways clearances, between the >>> chainstays and the fork blades. A 42mm tire will be 5mm closer to the >>> chainstays and the fork blades, so you need to check there for potential >>> clearance issues. >>> >>> >>> On Thursday, November 14, 2013 8:22:03 AM UTC-8, Jim Bronson wrote: >>> >>>> OK, so I should be able to run Hetres with fenders then. >>>> On Nov 14, 2013 9:40 AM, "Steve Palincsar" <pali...@his.com> wrote: >>>> >>>>> On 11/14/2013 10:21 AM, Jim Bronson wrote: >>>>> >>>>> OK, so 19+5=24. I majored in liberal arts. What is the >>>>> significance of the answer? A 650bx42 tire is 24mm smaller than a 700Cx32 >>>>> tire? (assuming sizes printed on the sidewall are more or less correct). >>>>> >>>>> >>>>> 19mm is the additional clearance you get because of the smaller rim. >>>>> As you can see, I'm a liberal arts major too: you lose 5mm, so you have to >>>>> subtract rather than add it because the tire is larger, so you have a net >>>>> gain of 14mm clearance. I should have said "add back", that's what I >>>>> meant. >>>>> >>>>> >>>>> >>>>> >>>>> On Thu, Nov 14, 2013 at 7:31 AM, Steve Palincsar <pali...@his.com>wrote: >>>>> >>>>>> On 11/13/2013 11:54 PM, Jim Bronson wrote: >>>>>> >>>>>>> I had short reach brakes before with 700x32mm tires and they barely >>>>>>> fit under the brake bridge. Don't know what that converts to in 650b >>>>>>> >>>>>> >>>>>> subtract the difference in radius (622 - 584 /2) of the smaller rim >>>>>> and add half the additional width (42-32 / 2) of the new tire >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> 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-bun...@googlegroups.com. >>>>>> To post to this group, send email to rbw-owne...@googlegroups.com. >>>>>> >>>>>> Visit this group at http://groups.google.com/group/rbw-owners-bunch. >>>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> Keep the metal side up and the rubber side down! >>>>> -- >>>>> 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-bun...@googlegroups.com. >>>>> To post to this group, send email to rbw-owne...@googlegroups.com. >>>>> >>>>> Visit this group at http://groups.google.com/group/rbw-owners-bunch. >>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>> >>>>> >>>>> -- >>>>> 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-bun...@googlegroups.com. >>>>> To post to this group, send email to rbw-owne...@googlegroups.com. >>>>> >>>>> Visit this group at http://groups.google.com/group/rbw-owners-bunch. >>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>> >>>> -- >>> 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-bun...@googlegroups.com. >>> To post to this group, send email to rbw-owne...@googlegroups.com. >>> Visit this group at http://groups.google.com/group/rbw-owners-bunch. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >> >> >> >> -- >> Keep the metal side up and the rubber side down! >> > -- > 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/groups/opt_out. > -- Keep the metal side up and the rubber side down! -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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