JMCHstore 60T High-Torque Rear Sprocket for Mini Bikes - Gold Zinc, 6-Hole #40/41/420 Chain

JMCHstore's 60-tooth gold-zinc rear sprocket is a heavy-duty replacement designed to increase low-end torque and climbing ability for compatible mini bikes using #40, #41 or 420 chains.

This precision-machined sprocket fits many popular small-bike models (Coleman CT100U, CC100X, Mega Moto MMB80/MMB105, Baja Doodle Bug DB30, Motovox MBX10, and similar platforms) and is built to handle upgraded engines 212cc and larger. Its 60-tooth profile delivers stronger acceleration and improved pulling power on steep trails while the corrosion-resistant gold zinc plating extends life in wet, dusty, or salty conditions. Before ordering, verify mounting pattern and tire diameter compatibility to ensure correct fit and safe operation.

Will this sprocket fit my mini bike and chain?

Compatibility depends on your bike's bolt pattern, center hole, and chain size. The JMCHstore 60T is made for #40/#41/420 chains and a six-bolt mounting layout with specific dimensions; it does not fit go-karts with different mounting patterns.

• Chain size: #40, #41 or 420 compatible
• Mounting: 6 holes, bolt circle 49 mm (center-to-center)
• Center hole: 37 mm diameter; mount holes 6.5 mm each
• Overall diameter: 245 mm (9.65 in)

How does a 60-tooth sprocket change performance?

A 60T rear sprocket increases mechanical advantage, shifting power toward low-speed torque rather than top speed. This makes starts, hill climbs, and technical off-road maneuvers easier while slightly reducing maximum velocity on flat runs.

• Stronger low-end acceleration and throttle response
• Better climbing and load-pulling capability on inclines
• Reduced chain slip thanks to precision-cut teeth
• Best paired with higher-displacement engines (212cc+)

Is this sprocket durable and weather-resistant?

The sprocket is CNC-cut from high-strength steel and finished with a gold zinc coating for corrosion resistance. These choices extend drivetrain life under high loads and in varied weather, while precision tooth profiling reduces wear on the chain.

• High-strength steel core resists bending under load
• Gold zinc plating protects against rust and corrosion
• Precision teeth minimize chain wear and noise
• Suitable for off-road and all-season use

What measurements and installation considerations should I know?

Measure tire diameter and verify mount spacing before upgrading to a 60T sprocket; a too-large sprocket can contact the tire if the wheel is small. This model lists exact dimensions so you can compare with your hub and axle clearance.

• Recommended minimum tire: 145/70-6 to avoid interference
• Bolt hole circle (center-to-center): 49 mm (1.93 in)
• Center bore: 37 mm (1.46 in); six 6.5 mm mount holes
• If unsure, measure wheel/tire assembly or consult a mechanic

Who is this for: Riders upgrading a mini bike for better low-end performance, riders who regularly tackle steep trails or carry loads, and mechanics replacing worn sprockets on compatible Coleman, Baja, Motovox, Mega Moto and similar mini bikes. Avoid this part if your machine uses a different mounting pattern (common on go-karts) or if your tire diameter is below the recommended size.