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Precession
From WikiPedalia
"Precession" refers to the tendency of a part subject to rotating stresses to rotate in the opposite direction of the stress rotation. In bicycle applications, this becomes a particular issue with the threads that hold pedals into the crank, and the threads that hold the bottom bracket assembly into the frame.
See the Pedals entry in this Glossary, and Jobst Brandt's article on Left Hand Threads on this site for a detailed explanation of precession.
