Allen Sports Premier Hitch Mounted 4-Bike Carrier for Vehicles with External Spare Tires Hitch insert fits 2" receiver hitches Quick set carry arms "snap" into place right out of the box Dual compound tie-down cradles & quick set straps individually secure and protect bicycles Extra long hitch insert designed to fit around just about any rear mounted spare tire No-wobble bolt(s) eliminates movement of rack inside of hitch