Originally Posted by Grimlock
If you really want to feel the difference, next time you're at the local co-op switch one crank to a different size. On a smooth stretch, it is easy to tell and will quickly get really annoying.
(I run a 170 on the left and a 175 on the drive side because those are the only two cranks that fit on the spindle without bottoming out onto the face of the BB. My co-op only has used JIS cranks and I've got an ISO BB. It seems absurd no one wants to donate their NOS Record Pista cranks. Jeez.)
When I stripped the pedal threads on my Bianchi, I had a 175 on one side, and a 165 on the other for about a month before switching to 171s. It was weird. I think it also led to the original unsealed BB getting pitted on one side...