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      03-18-2013, 05:26 PM   #175
slicer
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Drives: 'E46 M3 Race Car, '23 X7
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Quote:
Originally Posted by m3izle View Post
Just wondering why you guys put 35 in the front and 30 in the back. Probably a noob question.
Read this for an explanation on tire sizing:

http://www.tirerack.com/tires/tirete....jsp?techid=46

The aspect is a ratio or percentage of the tire width. In an effort to keep the sidewall heights consistent front to back, you need to use a higher aspect ratio on the narrower tire and a lower ratio on the wider tire. You will notice that people use the same ratio front and rear when they choose tire widths that are only 20mm different (like OEM). 20mm + usually requires differing ratios.
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