Thank you. 3.75" BS and they fit perfect. I wanted to go with the 4" BS, but I didn't want to "see if I'd get lucky" and not rub the caliper or not either. I'm glad I chose the 3.75" because they stick out just enough to give the Jeep the look I desired and they still stuff the wheel wells. (There is all kinds of room in between the rim and the caliper with the 3.75". Go with the 15x7 3.75"BS and you'll be pleased and won't have to worry about grinding down your caliper to fit the 4"BS.. some do, some don't I guess