Wilwood Front Blank-Flange Rotor Hat, 1.380-Inch Offset

A blank hub flange allows this Wilwood front hat to be machined for a verified assembly. Match 1.380-inch offset and the twelve-bolt rotor ring. 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: 171-14579
• Manufacturer-listed attachment hardware reference: 230-8008; 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
• Position in the specified brake assembly: Front
• Hat offset: 1.380 inch
• Rotor attachment interface: 12 x 8.75 inches; rotor attachment, separate from the hub flange
• Hub-flange mounting/clearance pattern(s): Blank — flange requires machining
• Center register diameter: 2.81 inches
• Rotor mounting hole/thread designation: 1/4-20
• Internal clearance diameter: 6.40 inches
• Mounting-face thickness: 0.25 inches

Fitment & Compatibility

For Custom twelve-bolt brake systems, compare the replacement with the actual hat and complete brake-kit instructions. A matching flange pattern alone does not establish rotor alignment or caliper clearance. 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

For fitment assistance backed by more than 20 years of experience, share the installed brake configuration with PMB Performance before ordering.