The Alloy USA Hub Conversion Kit is designed to upgrade and replace the non-serviceable wheel hubs found on 84-06 Wrangler and Cherokee. Now you can lock and unlock your front hubs to reduce driveline strain and improve fuel economy! The hub conversion kit includes a set of Rugged Ridge Manual Locking Hubs, outer Alloy USA Axle Shafts, 1/2 ton capacity aluminum internal mounting hub, U joints, machined front brake rotors, bearings, seals and hardware.... everything you need to upgrade your rig and prepare it for the trail. Maximum recommended tire size is 33 inch. Rotors are 5 on 4.5 inch. Can not be used with locking differentials.