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
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Description
xPrecision, 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.
FAQ
Q: What minibikes is this sprocket compatible with?
A: Fits minibikes using #40, #41, or 420 chains with a 37mm bore, including Coleman, Mega Moto, Baja Doodle Bug, and Motovox models.
Q: Is installation difficult?
A: The sprocket uses a 6-hole mounting pattern with pre-drilled holes for straightforward replacement in many setups.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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