Rotor Aluminum Sprint 42 Spline

The Wilwood Rotor Aluminum Sprint 42 Spline is a high-performance brake rotor designed specifically for sprint car racing and extreme motorsport applications where thermal management and rotational dynamics are crucial. This aluminum rotor combines lightweight construction with precision engineering to deliver consistent braking performance under sustained high-heat conditions typical of competitive racing environments.

Featuring a verified outer diameter of 10.2 inches and a thickness of 0.31 inches, this rotor is optimized for rapid heat dissipation through its drilled design, which reduces thermal fade during multiple high-intensity stops. The 42-spline axle mount provides secure, indexable installation with virtually no runout, critical for maintaining brake feel and preventing vibration transfer to the driver. The black anodized aluminum construction delivers essential weight savings while resisting corrosion from moisture and brake fluid exposure.

Sprint car operators and racing teams standardize on Wilwood components because the brand's rotor geometry and material selection handle the extreme duty cycles of oval track and dirt racing. The drilled design is particularly valuable in dusty or wet conditions where brake dust removal and water shedding prevent pad glazing. This rotor is an excellent choice for those looking to upgrade their braking system for improved performance and reliability.