I have it on good authority (http://sheldonbrown.com/podcasts/ grantpetersen.mp3) that a 700x23c wheel + tire is roughly equivalent in diameter to a 650Bx38c wheel + tire. So if you can measure your BB drop with a "normal" wheelset, this should give a pretty good idea of the predicted BB drop.
And from experience, I would leave the Canti mounts in place until you actually get the 650B rims test fitted to the bike ... just in case (for whatever unforeseen reason) Calipers don't work, you have a backup plan. ATMO, any bike is a good candidate for a "fun" conversion. Assuming this is not your primary bike, there is no harm in putting a worthwhile bike back into service and learning a few things along the way. And if it is your main ride, do it anyway. Good luck and Happy Holidays, Bryan On Dec 23, 1:19 pm, Steve Palincsar <palin...@his.com> wrote: > On Wed, 2009-12-23 at 10:11 -0800, Jim Cloud wrote: > > I was giving some consideration to converting a 27" frame bicycle to > > either a 700c or 650B size. Based on my e-mail conversations with Ed > > Braley (a frequent internet forum contributor who has a wealth of > > experience with 650B conversions), I decided that my bike would not be > > very suitable for a 650B conversion, although I'm still considering a > > conversion to 700c. One consideration, obviously, is the length of > > the crank arm that you're planning to use. You didn't mention the > > size of your frame, but generally a frame up to 61 cm would be most > > suitable for a "Normal" looking conversion. > > You'll get a bit more bottom bracket drop switching 630 to 584 than > switching 622: 4mm more if all else remains the same. > > You'll also need 4mm more brake reach. Those 4mm are often > insignificant switching from 630 to 622, but since some brakes barely > have enough reach for the 622->584 conversion, the extra may be a few mm > too far. > > Crank length can be an issue. On your side, though, back when 630 was > the common tire size, 170mm was the common crank length, whereas today > it's considered short by many. -- 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-bu...@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.
