Quote:
Originally Posted by Kontact
The question is: If force through the cranks and against the resistance of the chain deflects the BB to the side, where does that deflection force go when the deflection is taken out? The frame doesn't SPROING! back to center, so it isn't just released. It comes out about at the same rate it went in, and if constant pressure is applied to the pedals, where can it go?
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Constant, even pressure is not applied to the pedals.
I don't think the frame would spring back at the same rate because the force against the pedals varies throughout the pedal stroke. You can stretch a rubber band quickly, and release it slowly... Maybe the peak force on the pedal is at 3 oclock, maybe it is 100 newton meters, and maybe the frame flexes 6mm at 100nm. At the bottom of the pedal stroke, the pressure would have gradually dropped from 100 back to 0-10nm, and the frame would gradually flex back to straight before flexing the opposite direction as the opposite leg begins to apply pressure. The frame isn't flexing enough to be all that noticeable. It's not like bobbing around on a full suspension bike with no lockout.