Originally Posted by jeremywhitehorn
i haven't used 650c rims in years but i remember trying to mount a skinny tire on one and it wouldn't take; the tire wouldn't seat properly because the rim was too wide. those tri geek rims (and tires) are a different diameter than a MTB too.
http://sheldonbrown.com/tire-sizing.html
I have some NOS Velocity mtb rims that are super sweet...I will give you a deal. If you are interested, P.M. me. i have also dome quite a few 26" to 650c conversions on peoples mtn bikes. The rim is slightly larger diameter but the brakes usually have enuf reach. This swap makes a mtn bike a little steet rocket.