Wilwood Dynalite Front Hub Kit for 1955–1957 Chevrolet passenger cars — 12.19-inch Plain, Black

Tri-Five Chevrolet front spindles receive new hubs and four-piston disc brakes in this conversion. This Forged Dynalite front hub brake kit combines black powder-coated 4-piston calipers and 12.19-inch plain-face rotors. Founded in 1977 by Bill Wood and based in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. Its range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines, selected to work together as a complete brake system.

Technical Details

• Manufacturer part number: 140-7676.
• Rotor dimensions: 12.19 in; 309.63 mm diameter x 0.81 in; 20.57 mm thick.
• Rotor construction: Iron; vented; Plain Face friction surface.
• Calipers: 4 pistons; forged aluminum; stainless steel pistons.
• Caliper attachment: lug mount; 1/8-27 NPT hydraulic inlet.
• Caliper finish: Black Powder Coat.
• Supplied hub wheel bolt circles: 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm.
• Included wheel stud thread: 1/2-20.
• Wheel-size guide: 15 in; 381 mm minimum nominal diameter; verify actual template clearance.
• Sold as one kit. Mounting hardware is included. Replacement hubs are included.
• Brake pads are included; use the compound and installation instructions specified for this rotor package.
• Spindles, master cylinder, brake booster and hydraulic brake lines are not included.

Fitment & Compatibility

The Tri-Five Chevrolet application list covers Bel Air, Nomad, One-Fifty, Two-Ten and Sedan Delivery from 1955–1957, together with the listed 1957 Del Ray. Verify the original spindle before selecting the hub kit, especially on a car that has already received a disc conversion or suspension change. New hubs supply two wheel bolt-circle options and 1/2-20 studs; check that the intended wheels match the selected pattern. DS449 describes the bearing and hub assembly sequence and provides the clearance profile for the 12.19-inch rotor. The kit changes the hub and braking hardware but does not include replacement spindles, a booster or a master cylinder. Review those existing components as part of the finished conversion rather than treating the new calipers as a complete hydraulic system.

The application table below identifies the model-year and factory-equipment combinations. Match the entire row, including its numbered notes.

Package and installation requirements

• Included hubs offer 5 x 4.5 and 5 x 4.75-inch wheel bolt circles and 1/2-20 studs. Verify the intended wheel pattern and template clearance.
• The manufacturer specifies a +0.23-inch hub offset on each side. Account for that wheel-position change when checking tire, fender and suspension clearance on the Tri-Five Chevrolet.

Manufacturer references

• Wilwood product and configuration information
• Installation instructions

PMB Performance brings more than 20 years of brake and parts experience to fitment questions. Send us the axle or spindle details, current brake equipment and intended wheel dimensions if you need help checking this kit.

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.

Vehicle Applications

Application Notes

1. Kit may fit some 15" wheels. Check wheel clearance diagram in kit installation instructions before purchase.
2. This kit supplies front service-brake components. No parking-brake mechanism or parking-brake cables are included; verify the vehicle's separate rear parking-brake system.
3. Line kit included (manufacturer): None
4. Front line-kit reference: 220-7699