Old 02-02-19, 02:28 PM
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
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bicycles stay up because the rider steers the bicycle under their center of gravity, on average. If the rider can't do this, they are going down*. I doubt this is enhanced by raising the rider. Most people prefer the handling afforded by lower bb's, all else being equal.

The inverted pendulum is not really an example of stability. It's unstable in all positions and all lengths. It just shows that a shorter pendulum needs a higher bandwidth control system to remain upright. Conversely, bicycles are a stable system (self-righting) under normal operating conditions.

*just a simple thought experiment, if you are leaned at a given angle and want to get the center of contact of the wheels under your center of gravity, a higher bb will mean you have to move the wheels further on the ground in order to do this. So it's more difficult to control.
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