Rear Sprocket 52T 5.25 BC 520 Chain

The Rear Sprocket 52T 5.25 BC 520 Chain sprocket from M AND W ALUMINUM PRODUCTS is a precision-engineered component designed for micro sprint racing applications where weight, durability, and exact tooth engagement are critical to performance. This 52-tooth rear sprocket serves as the driven wheel in your 520-chain drivetrain, directly influencing acceleration, top-end speed, and overall power transfer from engine to wheels. Built from aluminum, this sprocket reduces unsprung mass compared to steel alternatives, improving handling response and reducing stress on the drivetrain during hard acceleration and cornering.

The 52-tooth configuration offers a mid-range gearing balance suitable for mixed track conditions, providing adequate low-end torque multiplication while maintaining usable top-end RPM for competitive lap times. The 5.25-inch bolt circle diameter (BC) ensures proper fitment to standard micro sprint rear hubs, while the 520-chain pitch designation confirms compatibility with 520-series roller chains—a common specification in small-displacement sprint racing. Aluminum construction delivers a natural finish that resists corrosion and oxidation, requiring minimal maintenance; the material's inherent strength-to-weight ratio makes it ideal for motorsport applications where every fraction of a pound matters and reliability under sustained high-RPM operation is non-negotiable.

Micro sprint racers and sprint kart competitors benefit most from this rear sprocket when building or upgrading drivetrain systems for consistent power delivery and reduced rotational inertia. Before installation, verify that your chain is genuine 520-pitch and that your hub accepts a 5.25-inch bolt pattern to ensure proper alignment and engagement. At 1.14 lbs, this component contributes meaningfully to total weight savings—a critical consideration in racing where gearing selection directly impacts lap time and fuel efficiency over a full heat or feature race.