Rear Sprocket 49T 6.43 BC 520 Chain

The Rear Sprocket 49T 6.43 BC 520 Chain from M and W Aluminum Products is a precision-engineered drivetrain component designed for sport bikes, street fighters, and high-performance motorcycle builds that demand reliability and durability. This 49-tooth rear sprocket serves as the final drive ratio amplifier in your chain and sprocket system, directly controlling acceleration response, top-end speed capability, and engine load characteristics.

Manufactured from lightweight aluminum alloy, this rear sprocket delivers the strength-to-weight ratio critical for minimizing unsprung rotational mass while enduring the extreme torque loads of aggressive acceleration and sustained high-speed riding. The 6.43-inch bolt circle (BC) ensures OEM-pattern compatibility with standard sport bike wheel hubs, while the 520-chain specification matches the industry-standard 520-pitch roller chain found on modern middleweight and superbike platforms.

Precision CNC machining and quality aluminum construction eliminate flex and runout, ensuring smooth power delivery, minimal drivetrain vibration, and extended chain and sprocket life compared to lower-grade alternatives. This 49-tooth configuration suits riders seeking a balanced gear ratio—offering improved acceleration without sacrificing top-end speed.