Depending on what set of tires I'm running the BS different. A 4in is good for up to 12.50 wide on. 3.75 is good up to a 13.50 wide. My Iroks are 36 13.50 15R on a procomp 15x8 with 3.75 BS. I would suggest a 3.75 if you want to tuck them in go with a 4 in
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