Wilwood Front 12.19-Inch Rotor Kit with Red Dynapro Radial Calipers for Chevrolet Tri-Five ProSpindle Cars (1955–1957), Plain

This Narrow Dynapro Radial front brake conversion combines four-piston calipers, 12.19-inch rotor rings, separate hats and replacement aluminum hubs. It is built around the Wilwood two-inch-drop ProSpindle interface. Red calipers and 12.19-inch plain face rotors are the selected configuration. Based in Camarillo, California, Wilwood Engineering was established by Bill Wood in 1977. Its disc brake systems serve motorsport, street-performance and specialized applications. Calipers, brake rotors, master cylinders, valves, fittings and brake lines are matched to the requirements of the whole system.

Technical Details

• Product identification: Wilwood 140-16907-R. Package quantity: one kit for the stated configuration.
• The brake package includes pads and required mounting hardware, excluding spindles, master cylinder and booster.
• Hydraulic line selection is a separate purchase. Check hose length, adapters and routing before assembly.
• Check the wheel-clearance diagram before purchase; the nominal minimum wheel diameter is 15 inches.
• Connect the hydraulic line through the 1/8-27 NPT caliper inlet.
• The kit includes new aluminum hubs and their bearing hardware. Select the 5 x 4.50, 5 x 4.75-inch wheel pattern and 1/2-20 studs.
• Rotor mounting is through separate aluminum hats, offset 1.430 inch and finished in black e-coat.
• Piston sizing follows the published 1.75, 1.75-inch specification. The included brake-pad compound is BP-10.
• Caliper selection is 4-piston Dynapro Radial Mount. Body finish: red powder coat; attachment: radial; piston material: stainless.
• Rotor package uses Ultralite HP 32 components. Each is 0.81 inch thick with 12.19-inch diameter and plain faces. Published material: Iron.

Fitment & Compatibility

Wilwood ProSpindle 831-16660 is the required front spindle and is sold separately. This Dynapro assembly places new hubs and 12.19-inch rotor/hat units on that spindle, with a published 0.34-inch outward track change per side. Use the original steering arms and their specified hardware. The vehicle rows cover 1955–1957 Bel Air, Nomad, One-Fifty, Sedan Delivery and Two-Ten, with Del Ray listed for 1957. Check the hub wheel pattern, hose selection and 15-inch wheel envelope. Confirm all year, model and brake-package details against the application table below, including the notes attached to each row.

PMB Performance has 20+ years of experience with parts and fitment details. Share your current brake setup, intended use and mounting measurements so we can help check the complete installation.

Manufacturer documentation: Installation instructions.

Manufacturer Warning

Applicable to brake pads only: Wilwood warns of exposure to arsenic, cadmium, hexavalent chromium compounds, lead, nickel, cobalt and antimony trioxide, chemicals known to California to cause cancer or reproductive harm. More information:

P65Warnings.ca.gov.