Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
The hat-mount Wilwood hub for 1955–1957 Chevrolet Tri-Five front assemblies places the brake rotor on a separate aluminum hat. Its 1.520-inch N dimension identifies this geometry apart from the adapter-mounted vented-rotor hub. Wilwood Engineering’s disc-brake range covers calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized systems. Bill Wood founded the company in 1977, and its base is Camarillo, California. Each part is chosen to suit the operating and installation requirements of the whole brake system.
Technical Details
- Manufacturer part number: 270-7631
- Material: Aluminum
- Finish: Bare
- Position: Front
- Wheel bolt pattern: 5 x 4.75 in; 5 x 4.50 in
- Wheel stud thread: 1/2-20
- Included: Bearing races and screw-on aluminum cap
- Weight: 3.1 lb
- Inner bearing specification: 370-0879 / A6 set (fitment reference)
- Outer bearing specification: 370-0877 / A2 set (fitment reference)
- Drawing dimension N: 1.520 inches
Fitment & Compatibility
Match the Tri-Five spindle and rotor-hat package to the complete dimensional drawing. Confirm the hat sits squarely on the hub and uses the specified three 1/4-20 retention screws.
Manufacturer Documents
The photograph represents the product family. Match the ordered configuration using the part number and specifications above.
Contact PMB Performance with the existing part identification and brake-system configuration for selection assistance. We draw on over 20 years of experience with parts and fitment.
