Motorcycle Transmission Gear And External Gearboxes For Chinese 50cc 110cc 125cc Engine

The motorcycle transmission gear is a key component used to effectively transmit the power generated by the engine to the rear wheel. It amplifies or decelerates the power through a series of gear combinations, thereby adjusting the driving speed and torque. The external gearbox is a transmission system installed outside the engine, usually including multiple gears for the rider to manually switch according to road conditions and needs.

Efficient Transmission
Our motorcycle transmission gears use high-precision CNC machining technology, and the tooth surface accuracy reaches DIN 6 standard, which effectively reduces the meshing clearance and energy loss, and improves the transmission efficiency to more than 98%.

Durability
The motorcycle transmission gear is made of 20CrMnTi high-strength alloy steel that has been carburized and quenched. The surface hardness can reach HRC58-62, which can effectively resist the metal contact wear caused by high-speed operation and extend the service life to more than 40% of ordinary 45# steel parts.

Low Noise
The motorcycle transmission gear adopts surface polishing treatment, and the surface roughness Ra value is less than 0.4 μm, which effectively reduces the gear meshing noise and makes the whole machine running noise less than 65 dB.

Heat Dissipation
The 125cc engine gearbox adopts an aluminum alloy fin heat dissipation structure, which accelerates heat dissipation by increasing the surface area and effectively improves the heat dissipation efficiency. After 2 hours of continuous operation, the surface temperature is controlled within 65°C, which is far lower than the industry average of 80°C.

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