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Jan14-11, 07:40 AM
Sci Advisor
P: 2,470
Two effects. Main one is the fact that the fork is angled, so the front wheel turns in the direction you lean in. That makes you go along a curve, and that causes centrifugal force to push you straight again.

Second one is gyroscopic effect on the wheel. This one is significantly stronger on a motorcycle, but it contributes to the bicycle's stability as well.