CQSPMOTO 40T 6-Hole Rear Chain Sprocket for Mini Bikes | 37mm Bore, 420 Chain

Discover the CQSPMOTO 40T 6-Hole Rear Chain Sprocket, engineered to refine how your minibike translates engine power to rear-wheel performance. This rear sprocket is designed for 40/41/420 chains and pairs with engines in the 212cc class and larger. Its robust geometry and precise fit help promote smooth engagement between chain and sprocket, reducing the chance of slip and preserving efficient power transfer during every ride.

Key specifications

• 40T sprocket with 6 mounting holes
• Center bore diameter of 37mm
• Includes 1 sprocket and 6 mounting screws
• Compatible with #40/41/420 chains for minibikes and small engines
• Carefully matched to ensure a tight, dependable fit without guesswork

Durability and materials

• Constructed from high-strength steel to withstand demanding loads and high speeds
• Galvanized coating provides rust and corrosion resistance, helping maintain appearance and function
• Coating and machining work together to keep engagement smooth across varied weather conditions

Performance and ride experience

• 40T design supports strong low-end torque and confident acceleration
• Helps improve hill-climbing ability by maintaining better chain engagement
• Promotes efficient power transmission, reducing strain on the engine during challenging terrains
• Designed to deliver reliable performance without altering overall drivetrain geometry

Versatility and compatibility

• Designed for minibikes and compact setups like Coleman CT100U, CC100X, RB100, B100 minibikes
• Also suitable for Baja Doodle Bug DB30, Mega Moto MMB80/MMB105, Motovox MBX10, and similar platforms
• Easy cross-compatibility with a range of rear-end configurations thanks to a standard 37mm bore

When upgrading, verify your chain type and bore compatibility to ensure a seamless fit. The combination of durable steel, rust-resistant coating, and a precise 40T ratio offers a practical upgrade path for riders seeking improved engagement and control. While results vary with riding style, terrain, and overall setup, many users notice smoother power delivery and enhanced confidence on inclines or sudden accelerations. This sprocket focuses on dependable performance and long-term value, helping you get more from your minibike without compromising reliability.