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Product details
This Wilwood hat accepts a 6 x 6.25-inch rotor interface. Verify 0.770-inch offset, 2.17-inch register and the blank hub-flange machining plan. Founded by Bill Wood in 1977, Wilwood Engineering designs and manufactures disc brake systems from Camarillo, California. Its calipers, brake rotors, master cylinders, valves, fittings and brake lines serve motorsport, street-performance and specialized applications. Individual components must be selected for the complete brake system.
Technical Details
- Manufacturer part number: 171-8975
- Rotor mounting hole/thread designation: 5/16-18
- Internal clearance diameter: 5.10 inches
- Mounting-face thickness: 0.32 inches
- Manufacturer-listed attachment hardware reference: 230-12176; verify the specific rotor and attachment arrangement before ordering hardware
- Component: Short-Offset Brake Rotor Hat
- Material: Aluminum
- Surface finish: Black E-Coat
- Rotor mounting method: Fixed Mount
- Hat offset: 0.770 inch
- Rotor attachment interface: 6 x 6.25 inches; rotor attachment, separate from the hub flange
- Hub-flange mounting/clearance pattern(s): Blank — flange requires machining
- Center register diameter: 2.17 inches
Fitment & Compatibility
Match this component to the documented Custom six-bolt brake systems. Confirm the mounting stack, center location and rotor hardware; vehicle model alone does not establish compatibility with a modified brake system. The blank hub flange is not ready to bolt on. Have a qualified machinist verify the drilling layout, register and finished mounting surfaces for the intended assembly.
Manufacturer Reference
Wilwood component specifications and dimensions
Ask PMB Performance for help comparing the installation requirements. We have more than 20 years of experience working with brake parts and fitment.
