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Message: <blockquote data-quote="CobraRGuy" data-source="post: 1473689" data-attributes="member: 24211">I have two sets of R58 Cobra R wheels with one set having 275/40-17 track tires and the other set street tires. With the HP I'm putting down I really need to get wider rubber on the ground. I could run an 18x9.5 wheel with 285/35-18 tires, but that would only give me 10mm more front and rear.I should really be running 335/30-18 F/R but there's no way to fit those inside the stock fenders, even with the rear lip rolled.I'm thinking I should be able to run 305/35-18 tires both front and rear if I can identify the correct wheel offset. I need an 18x10 wheel but I don't know what offset to use. Does anyone know?</blockquote>