Conveniently Carry a Spare Tire Anywhere. The RockBrawler II is a bumper mount tire carrier that can accommodate up to a 40in spare. Up-down and in-out adjustable, the carrier cleverly and securely tethers to the tailgate that allows them to open and close in tandem, permitting easy one-handed operation. Solid Steel Construction. The RockBrawler II Tire Carrier is made from 3/16 steel using CNC laser technology and then brake-formed into shape for a strong and precise fit. The Tire Carrier uses a heavy duty hinge, sitting squarely on top of the Rock Brawler II rear bumper, with Timken tapered bearings to keep the carrier swinging smoothly without sag or rattle, both of which are irritating symptoms of inferior carriers. | Poison Spyder Rear JK ROCK BRAWLER II Tire Carrier (Carrier Only)