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Oct. 15, 2020, 8:55 a.m. -  Hank Sola

I think you are correct.  However, I would think that the small contribution in forward momentum caused by the rebound is trivial compared to the momentum carried by to ~200+ pounds that the rider and bike have travelling at even a few miles per hour.    This is also where unsprung mass comes into play.  The lighter the rear end, the faster it can react (the less momentum in the rebund).

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