(SMBC-2525) This universal spare tire bike carrier is perfect for vehicles with a spare tire mounted behind the vehicle. The bike rack's folding support arms adjusts to accommodate spare tires that aren't in the center of the SUV, camper or motor home . This universal spare tire bicycle carrier also has 3 different width adjustments allowing it to fit onto tires from 7" wide to 10" wide. The spare tire bike rack is shipped assembled in the folded position. To install on a vehicle, simply loosen the adjustment knobs, unfold the bike rack, place it over the top of the spare tire and connect attaching straps around the diameter of the tire and behind the spare tire to the bike rack.