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I've worn out the centers from overinflation. Others say they haven't. Believe it, it is more than theoretically possible. YMMV.
I don't care about traction- as rmay says, know your car and you can handle it.
I won't run more than 50 psi anymore simply due to higher pressures shaking the **** outta me and my vehicle. The theoretically fractional fe gain definitely isn't worth that.
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