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Old 07-19-2005, 05:58 AM   #2
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Member#: 27790
Join Date: Oct 2002
Chapter/Region: E. Canada

Originally Posted by fastXT04
can i fit 235/40/17's on stock sti rims? the 17 by 7.5 04 bbs wheels? would that tire size fit safely
every tire manufacturer recommends a minimum of 17x8 wheel size for the 235/40x17. having said that - lots of people on this board are running them on 17x7.5 including our own lovable guru Uncle Scotty. Is it safe - your call. If you're worried about it, call an insurance company (not yours) and ask them if they will still insure the car if you have an accident and they find out you're running a "non-approved" wheel/tire combo. they'll probably say "no".

Originally Posted by fastXT04
...provide any peformance gain?
on that size wheel, the 235/40x17 tire will be a bit wider than the 225/45x17 and have a lower profile for better dry grip - probably a little worse in the rain. even more important for some people is the fact that the 235/40x17 size is smaller in diameter than the 225/45x17 size - it is "underdriven" by 2% and that gives you a favorable gearing advantage through all gears for quicker acceleration.

finally, the 235/40x17 size is often a pound or two lighter than the equivalent 225/45x17 tire.
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