Wilwood 160-5841 Ultralite HP 32 Vane Rotor 11.75x0.81 in. Plain Face 8x7.00

Vehicle Fitment

• Universal Fit - Compatible with any custom brake system using an 8 x 7.00 in. rotor bolt circle and a 6.38 in. lug ID / registration diameter
• Direct replacement rotor for Wilwood STM Front Drag Brake Kits (vented standard rotor replacement)
• Suitable for street rods, domestic and import street performance, rally, road race, late model asphalt (ASA, All Pro, SW Tour), late model dirt (STARS, UMP, IMCA), off-road, and industrial applications

Fitment Notes

• Non-directional (non-handed) rotor - no left/right designation; can be mounted on either side
• For use with Wilwood calipers and brake systems only - not compatible with OEM stock calipers
• Intended for moderate-temperature racing to street use - not rated for sustained extreme-heat applications; for high-heat racing use, consider the GT Series rotors
• Confirm rotor bolt circle (8 x 7.00 in.) and hat or hub registration compatibility before ordering

Features

• Ultralite HP 32 straight vane design delivers an efficient balance of cooling capacity and reduced rotating mass - ideal for dirt tracks, asphalt racing, and rear axle street service
• Cast from premium grade, long-grain carbon iron for long wear, high thermal stability, and strong resistance to distortion
• ULHP-32 precision-turned faces feature less than 0.001 in. variation in flatness, parallelism, and runout for smooth, consistent pad contact
• Plain face surface finish - clean, unslotted design suited to a wide range of pad compounds and applications
• Medium weight casting provides a practical balance of mass for heat absorption and efficient vane cooling
• Lightweight design at 8.10 lbs. helps reduce unsprung weight for improved suspension response and vehicle handling
• Vented construction with 32 straight internal vanes for continuous airflow through the rotor during use
• Interchangeable with Wilwood's earlier scalloped rotor in STM Front Drag Brake applications

Specifications

• Part Number: 160-5841
• Rotor Series: Ultralite HP 32 (ULHP)
• Rotor Style: Plain Face
• Mount Side: Non-Directional (fits either side)
• Rotor Diameter: 11.75 in.
• Rotor Width (Thickness): 0.81 in.
• Rotor Bolt Circle: 8 x 7.00 in.
• Rotor Mount Hole Size: 0.326 in.
• Lug ID / Registration: 6.38 in.
• Far Side Inside Diameter: 8.34 in.
• Vane Count: 32 Straight Vanes
• Material: Premium Grade Carbon Iron
• Surface Finish: Plain (Natural)
• Balanced: No
• Weight: 8.10 lbs.
• For Use with Stock Calipers: No
• Intended for Street Use: Yes (moderate temperature)

Included Components

• 1x Wilwood Ultralite HP 32 Vane Rotor - Plain Face (160-5841)

Product Description

The Wilwood 160-5841 is an Ultralite HP 32 straight vane brake rotor offering an efficient balance of cooling performance and reduced rotating mass at an accessible price point. Cast from premium grade, long-grain carbon iron and precision-turned to less than 0.001 in. variation in flatness, parallelism, and runout, this rotor delivers smooth, consistent braking across a broad range of competition and street performance applications. The 32-vane straight vane construction provides steady internal airflow to manage heat under hard braking on dirt tracks, asphalt late model classes, and rear axle service on pavement cars.

At 8.10 lbs., the lightweight ULHP design minimizes unsprung weight without sacrificing the thermal capacity needed for moderate-heat racing and performance street use. This rotor is non-directional, fitting either side of the axle, and is confirmed as a direct-fit replacement for the vented standard rotor used in Wilwood's STM Front Drag Brake kits - interchangeable with the earlier scalloped rotor design. Verify the 8 x 7.00 in. rotor bolt circle and 6.38 in. lug ID against your hat or hub before ordering.