Quote:
Originally Posted by kramnnim
The BB is flexing because of the downward pressure from the rider, not the rotational force. If you stuck a motor in the seatpost, the BB would not flex left/right very much, if any.
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But the BB would flex in the same direction if you pulled up on the opposite crank. The flex isn't a result of a simple stepping on the crank, but because that's the only direction the BB can go when it is trapped between the power stroke and the chain.
If it was just downward force, the BB would flex most at 6 o'clock, not 3 o'clock.