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      12-04-2011, 02:51 PM   #12
LarThaL
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Drives: 2011 M3
Join Date: Apr 2011
Location: West Springfield, MA

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Quote:
Originally Posted by ///M Rakete View Post
I'm going to go with P-Zero Corsas, the tire on the GTS. The 255/35 and 285/30 have the same diameter (don't ask me, those are the specs apparently).
Not true. Here's the math:

245/35/19:

19" wheel = 482.6mm
sidewall = 245 x 0.35 = 85.75mm

total diameter = 482.6 + (85.75 x 2) = 654.1mm

285/30/19:

19" wheel = 482.6mm
sidewall = 285 x 0.30 = 85.5mm

total diameter = 482.6 + (85.5 x 2) = 653.6mm

255/30/19:

19" wheel = 482.6mm
sidewall = 89.25mm

total diameter = 482.6 + (89.25 x 2) = 661.1mm


The 245/35 and 285/30 are within 0.5mm of each other. the 255/30 is 7mm larger.
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