I just went to a square set up with RPF1s 18x10.5 +15 all around. My tires are 275/40/18 and they rub slightly in the front on swift springs. Rolled my fender last night and its better but i'm betting a 35 aspect ratio will solve the issue if not vastly improve it.
I track my car and daily so on track it shouldn't be an issue but local streets leave alot to be desired for smoothness. looking into a 10mm wider fender but really don't want to spend 1k if a lower aspect tire will solve this issue.
Hope this info helps.
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