18x12 wheels offset?

seattleswimboy

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Jun 27, 2013
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Granite Falls, wa
I have been searching for an answer for some time now with no luck.
I am preparing my 03 cobra for esp class in autocross. I am a very experienced driver having raced a sti in stu for 8 years regionally and nationally.

I am trying to figure out what off set I need to fit 18x12 wheels with 345 tires and not rub the irs with 1.5-2 degrees of negative camber. I don't want to run spacers because that is added weight, so getting the right offset is critical. I can roll, pull, and cut the fenders so I am not worried about clearance on the fender side. Also this will be an autocross/track car only car and will not be driven on the street.

Thank you
 

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