Wilwood Front Rotor Hat with Flared Bell and 1.000-Inch Offset

A 1.000-inch offset and dual-pattern flange identify this Wilwood front hat. Select the correct twelve-bolt rotor and check the 3.06-inch register. Wilwood Engineering designs and builds disc brake systems in Camarillo, California. Bill Wood established the company in 1977; it supplies brake rotors, calipers, master cylinders, valves, fittings and lines for specialized applications, street performance and motorsport. The complete brake system determines which individual components are appropriate.

Technical Details

• Manufacturer part number: 170-12314
• Hub-side hole clearance diameter(s): 0.520 inches; these are clearance dimensions, not wheel-stud thread sizes
• Manufacturer-listed attachment hardware reference: 230-4572; verify the specific rotor and attachment arrangement before ordering hardware
• Manufacturer installation note: 3.06 " diameter register with counterbore for register ring.
• Component: Flared-Bell Brake Rotor Hat
• Material: Aluminum
• Surface finish: Black E-Coat
• Rotor mounting method: Fixed Mount
• Position in the specified brake assembly: Front
• Hat offset: 1.000 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, 5 x 4.75 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: 7.09 inches
• Mounting-face thickness: 0.25 inches

Fitment & Compatibility

This is a component for Matched big-brake conversions, not a complete brake kit. Check the hub location, rotor mounting surface and caliper alignment as a system before ordering. 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.