Quote:
Originally Posted by kramnnim
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.
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I didn't say "even pressure". You inserted that.
If you watch this video of what the BB is doing under heavy load, you'll see that the most BB sway is right during the power stroke and is largely gone by the time the pedal is at the bottom. If this was just an issue of putting weight on the pedals, the flex would be at the bottom to match Mark's graphic. Instead, that's when it is going away.