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.
An
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 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 650
Michael,
You should definitely measure BB drop with a set of wheel on first.
Take a pair of 700c or 27" wheels and measure the drop.
I converted a Serotta CRT that had 80mm of BB drop (which means a
fairly low BB) to 650b, with a resultant 248mm BB height with 32mm
Grand Bois Cypres tires on. It
