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Scilly.Suffolk in reply to @edscoble

How can you unwind a pedal by pedalling (forward)?

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freezing77 in reply to @Scilly.Suffolk

Precession
Mechanics. the motion of the rotation axis of a rigid body, as a spinning top, when a disturbing torque is applied while the body is rotating such that the rotation axis describes a cone, with the vertical through the vertex of the body as axis of the cone, and the motion of the rotating body is perpendicular to the direction of the torque.

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edscoble in reply to @freezing77

In layman's term; pedal go wobbly wobbly then says goodbye to thready.
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gbj_tester in reply to @freezing77

Precession

But we use left-hand threads on left-foot pedals so that the precession tends to tighten them

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