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Old 01-13-2011, 11:19 AM
kanicbird kanicbird is offline
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Join Date: May 1999
Posts: 18,787
It would seem like this beads have to move around a lot inside the tire. The outside of a tire does not rotate but goes from zero velocity to 2x the car (motorcycle) velocity following a 'n' like pattern per revolution

Also as the beads are approaching the zero velocity of the outer wheel speed it hits a bump, the contact patch.

It would seem like this beads should be in constant rolling (and perhaps 'flying' as it hits the contact patch) motion and maybe that constant motion disturbs a resonation pattern that caused a imbalance.