Wilwood Left 11.75-inch ULHD Plain Rotor, 0.99-inch Wide, Spec-37 Iron

For the left side of the matching oval-track brake, this ULHD ring provides a smooth 11.75-inch friction surface. Its sixteen curved vanes and 0.99-inch width are a distinct construction from heavier GT and HD rotor families. Wilwood Engineering is based in Camarillo, California and was founded by Bill Wood in 1977. It designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. The range covers calipers, brake rotors, master cylinders, valves, fittings and brake lines, all of which require selection around the full brake system rather than an isolated dimension.

Technical Details

• Manufacturer part number: 160-15878
• Diameter and thickness: 11.75 inches diameter x 0.99 inches wide
• Ring material: Spec-37 Iron
• Face pattern and coating: Plain Face; Plain
• Internal layout: 16 CV; curved
• Mounting direction: Left-hand
• Balancing and burnishing: Factory burnished no; balanced no
• Opposite-side component, ordered separately: 160-15877
• Rotor-to-hat/hub attachment circle: 8 x 7.00 inches
• Attachment hole size or thread: 0.326 inches
• Center / lug registration: 6.38 inches
• Far-side inside diameter: 8.46 inches
• Approximate component weight: 7.10 lb
• Quantity: one rotor ring; hat, hub, mounting hardware, calipers and pads are separate

Fitment & Compatibility

For moderate-temperature dirt or asphalt racing with a brake assembly specified for the 16-vane ULHD casting. The 0.99-inch width and plain contact faces must suit the caliper and pad package; a heavier-duty casting should not be replaced solely on matching bolt circle.

Manufacturer reference: Wilwood rotor specifications

PMB Performance can help you identify the matching brake components, drawing on over 20 years of experience. Include the current kit number and mounting measurements when requesting a fitment check.