Detroit Speed and Engineering has designed a 13" rotor package upgrade for the Front Speed kit or SpeedMAX kits. These DSE exclusive rotors feature a dual 5 x 5" or 5 x 4-3/4" bolt pattern and have a Geomet coating for corrosion protection. This 13" front brake rotor kit is designed for the DSE 1967-87 C10 truck SpeedMAX front suspension system and front Speed Kit that utilizes the DSE forged aluminum drop spindles with hub pack wheel bearings when utilizing stock GMT800 brakes. This kit includes new brake caliper mounting bolts. NOTE: If you have rear disc brakes, you will need to upgrade the calipers and brake pads for 13" rotors. See the instructions for caliper options.