Date: Tue, 7 Sep 2004 12:53:58 -0700

Author: Eric Ayars

Subject: Re: bike wheel


On Sep 7, 2004, at 11:53 AM, sampere wrote:

> Cliff and I have been discussing this off-line for a few weeks now.
> Anyway, the threads on the crank arm are right handed on the drive
> side and left handed on the non-drive side. So we've been discussing
> this. If you want to think about this, it's done so that each side
> gets tightened as you pedal. Assume that the bearings do not seize
> up.

I'm gonna object on this one. You have the handedness right --I just
checked it on my bike-- but if they're right-hand thread on the
right-hand side, and vice-versa, the pedals will LOOSEN while pedaling
forward with seized bearings.

Try it. Holding a pedal-wrench on the pedal spindle, you spin the
cranks forward to remove the pedal and backwards to install. Either

Dr. Eric Ayars
Assistant Professor of Physics
California State University, Chico
From Tue Sep 7 15:44:55 2004