Wilwood Rear Brake Rotor Hat with 0.39-Inch Face and 1.000-Inch Offset

This Wilwood rear hat has a 0.39-inch face and 1.000-inch offset. Compare the mounting stack, 2.78-inch register and twelve-bolt rotor circle. The manufacturer, Wilwood Engineering, was established by Bill Wood in 1977 and is based in Camarillo, California. It designs and builds disc brake systems with a range covering calipers, brake rotors, master cylinders, valves, fittings and brake lines. Motorsport, street-performance and specialized applications require components selected for the complete braking system.

Technical Details

• Manufacturer part number: 170-11328
• Surface finish: Black E-Coat
• Rotor mounting method: Fixed Mount
• Position in the specified brake assembly: Rear
• Hat offset: 1.000 inch
• Rotor attachment interface: 12 x 8.75 inches; rotor attachment, separate from the hub flange
• Hub-flange mounting/clearance pattern(s): 5 X 4.50 inches; verify the actual hub and wheel-stud clearance
• Center register diameter: 2.78 inches
• Rotor mounting hole/thread designation: 1/4-20
• Internal clearance diameter: 7.75 inches
• Mounting-face thickness: 0.39 inches
• Hub-side hole clearance diameter(s): 0.520 inches; these are clearance dimensions, not wheel-stud thread sizes
• Component: Short-Offset Brake Rotor Hat
• Material: Aluminum

Fitment & Compatibility

Match this component to the documented Matched twelve-bolt brake systems. Confirm the mounting stack, center location and rotor hardware; vehicle model alone does not establish compatibility with a modified brake system. Select the rotor and attachment hardware separately for the documented assembly. Follow the installation drawing for engagement and clearance at every mounting point.

Manufacturer Reference

Wilwood component specifications and dimensions

Our team at PMB Performance has over 20 years of parts and fitment experience. The existing component number and brake-system details help us check the match.