Rear Sprocket 49T 5.25 BC 520 Chain

The M AND W ALUMINUM PRODUCTS Rear Sprocket 49T 5.25 BC 520 Chain is a precision-engineered aluminum sprocket designed for micro sprint racing applications. This 49-tooth rear sprocket features a 5.25-inch bolt circle pattern and is engineered to accept standard 520-pitch chain systems. The aluminum construction provides a significant weight advantage over steel alternatives while maintaining the durability required for high-RPM racing environments.

With 49 teeth, this sprocket is sized for acceleration-focused gearing on micro sprint platforms, offering a mechanical advantage suited to track layouts demanding quick throttle response and gear multiplication. The 520 chain pitch is a racing standard that balances strength-to-weight ratio with reliable power transmission. The 5.25-inch bolt pattern ensures compatibility with standard micro sprint rear hubs, and the natural aluminum finish resists corrosion while allowing easy visual inspection of wear patterns during regular maintenance. Weight is a critical performance factor in sprint racing, and at 0.99 lbs, this sprocket contributes minimal rotational mass to the drivetrain.

This sprocket is engineered for drivers and teams running micro sprint platforms who prioritize efficiency and precision power delivery. The 49-tooth configuration is a proven choice for drivers seeking responsive acceleration in competitive settings. Proper chain tension, regular inspection for tooth wear, and compatibility verification with your specific micro sprint frame are essential before installation. M AND W Aluminum Products is recognized for producing high-precision drive components that meet the exacting standards of competitive racing.

When selecting a rear sprocket for your micro sprint, tooth count directly affects acceleration versus top-end speed. The 49-tooth specification represents a mid-range setup that delivers responsive power without sacrificing terminal velocity on faster track configurations. Aluminum sprockets require consistent maintenance—inspect teeth regularly for hooking or chipping, keep your 520 chain properly lubricated, and monitor bolt torque to ensure security during high-load cornering and acceleration phases.