Wilwood Rear Rotor Hat with Negative Offset, Minus 0.090 Inch

Negative 0.090-inch offset is essential to this Wilwood rear hat's location. Match the 12 x 8.75-inch rotor circle and 5 x 4.50-inch flange. Established in 1977 by Bill Wood, Camarillo, California-based Wilwood Engineering designs and manufactures disc brake systems. Its master cylinders, calipers, brake rotors, lines, fittings and valves support motorsport, street-performance and specialized applications, with each component selected for its role in the complete brake system.

Technical Details

• Manufacturer part number: 170-12471
• Position in the specified brake assembly: Rear
• Hat offset: -0.090 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: 3.06 inches
• Rotor mounting hole/thread designation: 1/4-20
• Internal clearance diameter: 8.25 inches
• Mounting-face thickness: 0.31 inches
• Hub-side hole clearance diameter(s): 0.580 inches; these are clearance dimensions, not wheel-stud thread sizes
• Manufacturer-listed attachment hardware reference: 230-8008; verify the specific rotor and attachment arrangement before ordering hardware
• Manufacturer installation note: 3.06 " diameter register with counterbore for register ring.
• Component: Short-Offset Brake Rotor Hat
• Material: Aluminum
• Surface finish: Black E-Coat
• Rotor mounting method: Fixed Mount

Fitment & Compatibility

Identify the installed brake conversion before choosing this hat for Matched twelve-bolt brake systems. The offset, center register and attachment hardware must agree with the rotor and hub in that assembly. 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

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