CILOYU 60T 420 Sprocket and 90-Link Chain Kit for Mini Bikes (40mm Bore) — Boosts Low-End Torque, Includes Hardware

CILOYU's 60-tooth 420 sprocket kit with a 90-link 420 chain upgrades mini bikes for stronger low-speed torque and smoother hill starts.

This complete sprocket and chain set is engineered for small off-road bikes such as the Coleman CT200U series and many Baja, Motovox, Monster Moto, and similar 80–200cc mini bikes. The kit replaces a standard 50T sprocket with a 60T unit and includes mounting hardware, spare links, a chain breaker, and a small 10T counter sprocket to simplify installation and get your bike back on the trail quickly.

How does the 60-tooth sprocket affect riding performance?

The larger 60T sprocket increases the leverage delivered to the rear wheel, converting engine RPM into greater torque for low-speed situations. You’ll notice stronger initial acceleration, improved traction on inclines, and easier control in technical terrain without needing to over-rev the engine.

• Boosts low-end torque compared with a 50T sprocket.
• Reduces wheel slip when launching on loose surfaces.
• Better for hill climbs and heavy-load runs.

What exactly comes in the kit and why are those parts useful?

The package contains everything required for a full sprocket-and-chain swap so you won’t need to source extra components. Included are a 60T 420 sprocket with 40mm bore, a 90-link 420 chain, spare 42-link chain, master links, fasteners, a 10T counter sprocket, a 3/16" keyway, and a chain breaker tool to size the chain perfectly.

• One 60T 420 sprocket (40mm bore) — main gearing change.
• 90-link 420 chain plus a 42-link spare and five master links for adjustment.
• Ten screws/nuts, 10T sprocket, keyway, and a chain breaker for installation.

Which bikes is this sprocket and chain compatible with?

This drivetrain kit fits many small-displacement off-road and pocket bikes that use 420 chain and accept a 40mm bore sprocket. It’s designed to be a direct upgrade option for several popular models across different manufacturers, but double-check bore and chain size before ordering.

• Coleman Powersports: CT200U, CT200U-EX, BT200X, KT196, CT100U, CC100X.
• Baja Motorsports: MB165, MB200, Heat/Mini Baja/Warrior series, Doodlebu* DB30.
• Motovox, Monster Moto / Mega Moto (MMB80/105), and similar 80–105cc mini bikes.

Who is this for? This CILOYU 60T sprocket and 420 chain kit is intended for riders and mechanics who want more low-speed pull from their mini bike—especially useful for trail riders, hill climbers, and users who carry heavier loads or frequently ride in mud, sand, or uneven terrain. It’s also a practical replacement kit for DIY maintenance: it supplies hardware and a chain breaker so home mechanics can complete the swap without specialty tools. Before purchasing, verify your mini bike uses a 420 chain and that a 40mm bore sprocket suits your axle and mounting setup to ensure a smooth fit.