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timing belt pulleys: why is P.D. > O.D. ?

For timing belt pulleys, why is Pitch Diameter greater than Outside Diameter ? I would think it would be the opposite of that. ( I have been looking on the McMaster-Carr and Stock Drive Products sites. )

Thanks !

Reply to
pogo
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The belt sticks out beyond the OD of the pulley.

Tim

Reply to
Tim Auton

Outside

Products

Thanks! *Now* it makes sense! JCD

Reply to
pogo

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