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      03-01-2013, 05:10 PM   #7
Kgolf31
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Drives: 2007 Z4MC, 2012 128i
Join Date: Sep 2008
Location: Ohio

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For those not familiar with autocross, the class OP is running in cannot change wheel diameter/width and must stay within +- 6mm of offset.

You cannot change bushings, it is violation of stock rules.

With that being said, OP stick with 225s. You "may" be able to fit 235s but you will lose grip. Let me explain.

Putting too much tire on a wheel isn't always the best thing. Under high g-load and corner load, the tire will start to shimmy back and forth on the wheel before it actually starts to grip. With that being said, your front end is going to feel light and un-responsive. The sidewall will also be too soft.

225 tire will stretch a bit on the wheel compared to the 235, so the tire will act more responsive because there will be no shimmy of the tire back and forth on the wheel.

For reference, I run 235/265 on my Z4M. I have 18x8 and 18x9. I could easily go 245/275 but it would be too much tire.

This is what my Hankook RS3s look like on my fronts, they are plenty of tire.

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