My F1s are bald after two weeks of stage 2! So I have no way to hook up the extra HP. I know the 305/40/18s are not made for our 9.5 rims, but I ordered them hoping to get some use out of them this summer. Does anyone have any problems with them on our stock size rims? What tire pressure are you running in summer? The Discount Tire store will not give me the tire protection, due to wrong tire/whell combo!