This article is from the Bicycles FAQ, by Mike Iglesias with numerous contributions by others.
From: Jobst Brandt <jobst.brandt@stanfordalumni.org>
Date: Fri, 17 Oct 1997 10:00:05 PDT
_____________ _________
*/ \* */ \*
*/ \* *| |*
*/ \* *| |*
*/ \* *| |*
*| |* _________*|__________/*
*| |* */ *|
*| |* *| *|
push--> *| pull & turn <-- |* *| *|
*| |* *| *|
*| |* *\_________*|__________
*| |* *| \*
*\ /* *| |*
*\ /* *| |*
*\ /* *| |*
*\_____________/* (*)tread *\_________/*
 
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