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      10-03-2011, 10:01 PM   #70
Radiation Joe
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Drives: '11 JB/BBe-6sp-e90
Join Date: Jul 2008
Location: Macungie PA

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2011 e90 M3-Sold  [4.25]
2003 RS6 - Sold  [0.00]
2009 e90 M3 - Gone  [0.00]
2003 M3 SOLD  [0.00]
old 2002  [5.00]
Originally Posted by View Post
Of course a certain amount of sidewall flex is needed - but the question is HOW MUCH? There is an optimum slip angle for max grip which depends on ALOT of things. The type of tires you're running (slicks, r-comps, streets have VERY different optimum slip angles). Also your alignment, weight, suspension, geometry will all matter. Just because you threw out a race car example doesn't make much of a point.

I have first-hand clinical results - running 18's versus 19's back to the back on the same car, same day with same alignment and same rubber I was able to shave off almost 4 seconds at road atlanta - thats what I have to report from experience from MY car - I don't speak for all.
If you attribute the difference between 18s and 19s for a 4 second gain per lap, you've lost all credibility. Even if 19s were a better performance option (they aren't), they would never gain 4 seconds a lap in an apples to apples comparison. I'd be damned impressed if the stock 19s gained 1 second over the stock 18s. And it would almost certainly be attributable to differences in hot tire pressures.

Dinan compliment of stuff plus PF rotors and RG63s. Enough for now.
Why, yes. I am an abrasive bastard.