About the flex disc. if that's shot the vibration gets increasingly worse as speed increases. On the other hand, an out of balance tire may have 3 or 4 resonance points (depending on speed) when the vibration will be more pronounced. (Compliments of my local friendly Michelin dealer)

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Jeff L
1987 300e
1989 300e
1987 BMW 325

[This message has been edited by jeffsr (edited 04-17-2000).]