Roof-Mount Bicycle Carriers come in Fork-mount and Upright style. The Fork-mount style carries one bike securely by front fork and rear wheel. The Upright style carries one bike locked by the frame with both wheels secured. Carrying clamps feature rubber inserts to help protect bike surfaces. Both styles attach to Sport-Utility Bars and two carriers can be used on one roof rackFork-mount, Aluminum, lockable, mounts to T-Slot compatible racks, fits all bike styles Fork-mount OR Upright, Aluminum, lockable, mounts to T-Slot compatible racks, fits all bike styles. Must have Sport-Utility Bars to mount. Only use Upright (82207942) for Jeep Patriot.