Wilwood Front Red Dynapro Plain-Rotor Hub Kit, GM Disc-Spindle Applications (1970–1978), 12.19-Inch

Plain vented 12.19-inch rotors and red Dynapro 6 calipers form this Wilwood front hub conversion. Replacement hubs carry the friction rings on the specified GM disc spindle, with a -0.28-inch change in wheel mounting position. The kit's physical mounting pattern still depends on the original 11-inch rotor spindle. 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: 140-10738-R
• Type: Forged Dynapro 6 Big Brake Front Brake Kit (Hub)
• Calipers: Dynapro 6; 6 pistons; Red Powder Coat.
• Bores: 1.62, 1.38, 1.38 inches. Pads: BP-10.
• Rotors: 12.19-inch diameter × 0.81-inch width; Plain Face, Iron, Plain. 32 vanes.
• Wheel mounting change from OE: -.28 inches per side.
• Hubs: Hub - Vented Rotor Offset; 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.
• Not included: hydraulic lines, master cylinder, booster or spindles. Reuse suitable matching components.
• Conditional wheel minimum: 15 inches. Check the clearance drawing for barrel and spoke offset.

Fitment & Compatibility

DS640 locates this conversion on the GM disc spindle originally used with an 11-inch rotor. The new friction ring is 12.19 inches, so the original size is a mounting identifier rather than the supplied brake diameter. Preparing the retained knuckle and shimming the caliper correctly remain part of installation. The hub shifts wheel mounting -0.28 inches from the reference, making tire-to-suspension space a separate concern from spoke clearance. Check the precise application row, actual wheel template and chassis-specific hose connections.

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.