Rear Sprocket 51T 5.25 BC 520 Chain

The M AND W ALUMINUM PRODUCTS Rear Sprocket 51T 5.25 BC 520 Chain is a precision-engineered sprocket designed for high-RPM motorsport applications requiring reliable gear reduction. Manufactured from aluminum in a natural finish, this 51-tooth sprocket delivers the mechanical advantage needed to optimize engine power delivery across the RPM band in competitive micro sprint racing environments where weight savings and consistent performance are critical.

Specifications verify this sprocket's purpose: 51 teeth provide moderate gear reduction suitable for speed-focused applications, the 5.25-inch bolt circle accommodates standard micro sprint rear hub configurations, and the 520 chain pitch ensures compatibility with established drivetrain systems. The aluminum construction minimizes unsprung weight while maintaining rigidity under high-load acceleration cycles. At 1.11 lbs, this sprocket reduces rotating mass compared to steel alternatives, directly improving throttle response and reducing strain on the rear differential during sustained high-RPM operation.

This sprocket targets micro sprint racers and off-road motorsport competitors who prioritize power transmission efficiency and weight reduction. Buyers evaluating a 51T rear sprocket for sale typically operate in classes where gearing directly impacts lap times and fuel efficiency. The 520 chain compatibility means this sprocket integrates seamlessly into existing drivetrain setups without requiring adapter components, reducing installation downtime between race events.

Aluminum sprockets occupy a specific position in motorsport: they balance weight savings against wear rates compared to hardened steel options. The 51-tooth count positions this sprocket as a mid-range gearing choice—aggressive enough for acceleration-focused tracks but tall enough to maintain manageable engine speeds on longer straights. M AND W ALUMINUM PRODUCTS specializes in motorsport-grade drivetrain components, and this sprocket reflects that focus through precision tooth profile and consistent manufacturing tolerances.