Wilwood Polished Front Dynalite Hub Conversion for 1955–1957 Chevrolet — Plain-Face Rotors, 12.19-inch

The polished/plain-disc combination preserves an uninterrupted rotor face in this front conversion. Its polished 4-piston calipers and 12.19-inch plain-face rotors are assembled around the requirements of 1955–1957 Chevrolet passenger cars. Wilwood Engineering, founded by Bill Wood in 1977, designs and manufactures disc brake systems in Camarillo, California. The range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications, with each component chosen to suit the complete brake system.

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.

Read the full application entry below, including the brake, spindle and numbered-note fields that apply to that vehicle.

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.

Technical Details

• Manufacturer part number: 140-7676-P.
• Calipers: 4 pistons; forged aluminum; stainless steel pistons.
• Caliper attachment: lug mount; 1/8-27 NPT hydraulic inlet.
• Caliper finish: Polished aluminum.
• 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.
• 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.
• Wheel-size guide: 15 in; 381 mm minimum nominal diameter; verify actual template clearance.
• 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.

Manufacturer references

• Wilwood product and configuration information
• Installation instructions

A vehicle that has already been modified needs a hardware check as well as a model-year check. PMB Performance offers over 20 years of experience to help compare the axle, spindle, wheel and brake details before you order.

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