40T High-Speed Rear Sprocket (6-Hole, 37mm Bore) – #40/41/420 Compatible for Coleman CT100U/CC100X, Mega Moto MMB80/105, Baja Doodle Bug DB30, Motovox MBX10/MBX11

Precision, Durability, and Practical Upgrade for Your Minibike

The 40T High-Speed Rear Sprocket is precision-machined from hardened steel to handle high torque without deformation. It supports standard chains #40, #41, and 420, making it a reliable upgrade for minibikes that use a 37mm bore. This isn’t a cosmetic accessory; it’s designed to stand up to the demands of regular riding, with a focus on consistent chain engagement and smooth power transfer.

When you’re out on the trail or in the yard, you want parts that feel solid and predictable. This sprocket delivers those sensations: crisp shifts in acceleration, steady pull on inclines, and a chassis-ready confidence that comes from quality materials and tested manufacturing processes. While not a guaranteed result, riders may notice improved efficiency and a more composed throttle response in everyday use.

Direct Compatibility and Hassle-Free Upgrades

Designed as a direct replacement for popular minibikes—Coleman CT100U/CC100X, Mega Moto MMB80/105, Baja Doodle Bug DB30, and Motovox MBX10/MBX11—this sprocket ensures a seamless swap when paired with a 37mm bore. The 6-hole mounting pattern aligns with OEM layouts, and the pre-drilled holes help you reuse existing hardware, reducing installation time and wheel downtime.

• Universal minibike compatibility with common model lines
• 6-hole mounting pattern for secure, even load distribution
• Pre-drilled holes for straightforward upgrades or repairs

Performance-Oriented Design

The 40-tooth configuration balances speed and torque, contributing to smoother acceleration and more predictable power delivery under varied riding conditions. Heat-treated teeth are engineered to resist wear from chain friction, helping the sprocket maintain performance across multiple rides and seasons.

• 40-tooth design for balanced acceleration and torque
• Heat-treated teeth to resist wear and extend life
• Durable, hardened steel construction for demanding use

Quality Assurance and Real-World Ready

Each sprocket undergoes load testing to help ensure consistent performance under riding conditions. Whether you’re upgrading for weekend fun or routine maintenance, this component is positioned as a robust, reliable option for recreational and heavier-duty use.

What you gain: a sturdy, compatible, and easy-to-install upgrade that aligns with OEM hardware and performance expectations, without promising outcomes that go beyond the user’s control.