Wilwood Front Red GT Rotor/Hub Conversion for Later GM Disc-Spindle Cars (1979–1990), 12.88-Inch Rotors

Red Superlite calipers clamp GT slotted 12.88-inch rotors in this Wilwood later-spindle front conversion. Replacement hubs and separate hats position the friction rings and wheel mounting surface. The +0.17-inch change from the OE reference must be included when assessing wheel and tire fitment. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings, and brake lines for motorsport, street-performance, and specialized applications.

Technical Details

• Manufacturer part number: 140-10492-R
• Type: Forged Narrow Superlite 6R Big Brake Front Brake Kit (Hub)
• Calipers: Forged Narrow Superlite 6R; 6 pistons; Red Powder Coat.
• Bores: 1.62, 1.12, 1.12 inches. Pads: BP-10.
• Rotors: 12.88-inch diameter × 1.10-inch width; GT Slotted, Spec-37 Iron, Black Electro Coat. 48 curved vanes.
• Wheel mounting change from OE: +.17 inches per side.
• Hubs: Hub - Hat Mount; Aluminum; Bare.
• Wheel bolt circles: 5 x 4.50; 5 x 4.75 inches.
• Included: paired calipers, pads, rotors, brackets and assembly hardware, replacement hubs, rotor hats.
• Not included: hydraulic lines, master cylinder, booster or spindles. Reuse suitable matching components.
• Conditional wheel minimum: 17 inches. Check the clearance drawing for barrel and spoke offset.

Fitment & Compatibility

The later GM spindle conversion has its own bearing and bracket requirements even where a car resembles an earlier application. Confirm the original 11-inch-rotor knuckle against DS612 and the precise year/model row. The hub's +0.17-inch change is measured at the wheel mounting face; it does not describe rotor width or automatic spoke clearance. After spindle preparation, check rotor centering, wheel registration and the wheel template, then complete the separately selected hydraulic connections without contact through steering movement.

Match the individual model, year, submodel and brake configuration in the fitment table below.

PMB Performance has over 20 years of brake-system experience. Contact us with the vehicle and installed hardware details for fitment help.

California Proposition 65 warning — brake pads only: WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.