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I am getting my H&R Race springs installed early next month. But I want to get my BFG's on this week. My question is can I fit an 315 tire with an 18 inch rim with out lowering the car? Will the tire hit the IRS bolt?
As long as the backspacing is right, you'll be okay. Just for your own sanity, mount the wheel/tire on the car, torque it down and just check it. I think you'll be okay, I can't remember a 18x10 wheel that didn't fit! Good luck!