Side Bell Bearing Cup

The Winters Side Bell Bearing Cup (SKU WIN7310, Part Number 7310) is a precision axle bearing race engineered for high-performance racing and heavy-duty driveline applications. This steel bearing cup serves as the inner race surface in Winters quick-change rear ends and side bell assemblies, delivering the precise fitment and durability required in sprint cars, drag racing vehicles, and off-road competition trucks where bearing reliability directly impacts performance and safety.

Constructed from hardened steel, this bearing race is manufactured to tight tolerances to ensure proper load distribution and minimize radial play in the axle assembly. The cup's design accommodates the corresponding bearing cone, creating a robust race interface that handles the extreme forces generated during acceleration, cornering, and sustained high-speed operation. At 0.37 lbs and compact in footprint, the bearing cup integrates seamlessly into Winters' modular side bell hub systems, allowing racers to customize gear ratios and configurations without replacing the entire assembly. The precision-ground surfaces resist wear and maintain consistent preload characteristics over extended racing seasons.

This component is essential for sprint car drivers, drag racers, and off-road competitors who rely on Winters quick-change differentials for rapid gear changes and reliable driveline performance. Replacement or maintenance of bearing races is a standard part of seasonal rear-end rebuilds in competitive racing, where worn races compromise bearing fit and introduce unwanted noise and vibration. The Winters bearing cup is sold individually, allowing racers to service one side or rebuild the entire assembly as needed.

Winters Performance is recognized within the racing industry for precision differential and quick-change rear-end systems used across sprint car, midget, and drag racing platforms. Bearing races are wear items subject to normal deterioration; inspection and replacement as part of preventive maintenance ensure continued reliability and performance consistency.