I don't know why, but I have 1 1/4 inch clearance on the passenger side and 1/2 inch on the driver side. I knew there was a difference, but I never had an issue with it.

M/T tells me the tires will grow 1 1/2 inches @ 150 mph. My car runs 140 mph.

I checked the squareness of my rear to the front crossmember, and it is dead square. I guess I need to cut my driver quater panel.