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right now i have staggered 17's..i am about to but 18x8.5 all around...will there be a problem with the dsc and computer since the width of the front tires is changing...also do you think that i can put 235/40-18 on the front ones and 255/40-18 on the rear or is there some medium ground i should be using on all 4??
 

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If you run 235/40-18 on the front then you should mate it w/ 255/35-18 on the rear. Also you might consider 225/40-18 on the front since that's the factory configuration for 18".

Actually, come to think about it, since your rims aren't staggered, you might as well go w/ 235/40-18 all around. You'll be able to rotate your tires and there would be less understeer.
 
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