The R1 Concepts Geo-Carbon drilled-and-slotted rotor for 1998–2012 Sterling Acterra with hydro disc brakes is a rear left replacement for those vehicles. It features a drilled and slotted braking face and Geo-Carbon construction, intended specifically for rear left service on compatible Acterra models and useful when replacing a worn rotor to renew the brake surface.
R1 98-12 Sterling Acterra (Hydro Disc Brakes) Rear Left Drilled & Slotted Geo-Carbon Rotor