Bad Ass Unlimited Polaris RZR XP Spare Tire Rack. Our rack was designed to mount directly to your rear bumper. The bolt patter is 4 x 156. Our RZR spare tire rack comes and extra set of lugs for clean mounting. The tire rack stud size is the same as as your RZR at M12 x 1.5. Fabricated from Mild steel this RZR Spare tire rack only weighs 6 lbs.. Powder coated semi gloss black for a clean off road look. This RZR Spare tire rack will work on both Turbos and Non Turbo machines, 2 and 4 seat platforms.