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Honestly debating selling these and looking into something new though. Thought I had a flat tire last week and took the beast in. Shop told me I don't have a flat tire but my wheel was cracked due to hitting (unavoidable) bumps in the road. All three other wheels were dented from the same thing. Got them all fixed and had to take it in again less than a week later due to another crack. Shop guy was telling me that riding 18s on such a low car is probably going to continue having problems... Don't exactly know what to do
You do not have enough suspension travel for the size of tire and rim. The rim has become part of the suspension----the tire is so small it is no longer part of the suspension.The shock from irregular road conditions is going to the rim and you can see the abuse. Go back to a smaller rim and put some rubber on it. The 17" rim is barely marginal especially in rough road conditions where a 16 or 15" rim would be better. Remember the smaller the rim the more rubber is between the rim and the road!!!
I'd look at your suspension setup....if you have stiff springs with shocks that have very little travel no wheel & tire setup will tolerate much! Lots of high performance cars these days run large wheels with low aspect ratio tires without issues like you are experiencing. It's all about balance. Going with smaller diameter wheels & fatter rubber might help but I doubt that will end your problem, and your handling will likely suffer. Go with coilovers & adjust them upward is a possible solution.