This is a direct replacement for the heavy and high drag OEM unit bearing hub. Designed for maximum weight savings and reduction of drag, this unit features triple low drag bearings, an aircraft aluminum housing, and a lightened, heat treated aircraft alloy hub. The rotating torque is 75% less than the OEM assemblies. Our alloy steel hub is shot peened and features extensive internal tulip form for maximum weight reduction. A weight savings of 6 pounds per vehicle is obtained. Sold as a pair. This is a perfect match to the MW front brake kit (P/N 75530), combining maximum weight reduction with the stopping ability required for Drag Race applications. The unit includes 2" long 1/2"-20 wheel studs on a 4-3/4" bolt circle. Contact us to order with 3" long studs. For drag race applications only.