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Old 01-13-2011, 02:04 PM
CurtC CurtC is offline
Join Date: Dec 1999
Location: Texas
Posts: 6,652
Originally Posted by Philster View Post
At speed builds, the axis of rotation moves away from the axle center towards the center of the rotating mass (because the wheel/tire is out of balance).
But that's not what happens. The vibration of the suspension doesn't move so that the center of rotation becomes the center of mass for the tire - if it did that, we wouldn't need to balance wheels/tires at all. The springiness of the suspension tends to emphasize the off-center effect.

So we have a positive result.
We have positive feedback, which makes for an unstable system.