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      03-31-2010, 01:30 PM   #1
cgroppi
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Drives: 2007 Z4 M Coupe
Join Date: Mar 2010
Location: Tempe, AZ

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R compound sizes for autocross

I just got a 2007 Z4mc that I will be running in the new AS class. I've already taken care of the alignment, an extra set of stock wheels, shocks (Koni 8711 DA), and I'm getting a custom hitch made next week for a tire trailer.

The next thing is the tires. Since it seems not many people autocross Z4m's, I am having trouble finding info on what tires will fit under the car without rubbing badly. The two main choices for tires are the Hoosier A6 and the Kumho V710. For the A6s, I could get 245/40R18s in front and 275/35R18s in back. For the Kumhos, the available sizes would be 245/35R18s in front and 285/30R18s in back. Never mind if they will fit on the wheel. That can be done. The question is will they fit under the car?

I'm pretty sure the Hoosiers will make it, not sure about the Kumhos. Anyone have any experience actually getting these under a Z4, or know of anyone who has?

-Chris
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