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      12-13-2012, 02:43 PM   #2
Car54
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Drives: 1999 Z3 Mcoupe | 2008 M3/4
Join Date: Sep 2007
Location: Lutz, FL

iTrader: (1)

Taller tires have better fore/aft grip. Shorter (and presumably stiffer) sidewalls increase effective spring rate.

I think the stock tires were chosen to increase rear acceleration traction (tall and wide) and provide understeer and a nimble feel (narrower and shorter).
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