Wilwood Front Black Superlite 12.88-Inch GT Hub Kit, Later GM Disc-Spindle Cars (1979–1990)

Black Superlite 6R calipers and 12.88-inch GT rotors form this Wilwood conversion for the later GM disc-spindle family. The replacement hubs locate the wheel mounting face +0.17 inches from the stated OE reference. Separate hats carry the 1.10-inch-wide friction rings. 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
• Type: Forged Narrow Superlite 6R Big Brake Front Brake Kit (Hub)
• Calipers: Forged Narrow Superlite 6R; 6 pistons; Black 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

Read the exact model/year row rather than applying the combined 1979–1990 span to every GM vehicle. Identify the original 11-inch-rotor spindle and follow DS612 for the required modifications. Include the wheel-position change when checking tire and fender space. Supply hydraulic lines separately and verify the caliper's full wheel-clearance profile before assembly.

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.