Product Features:
1. Fully sealed design, free from daily maintenance
2. When changing gears, the clutch moves in and out with a spiral track, which makes the combination smoother. Make the gear change more accurate and higher tolerance rate
3. Built-in overload device, gear in and gear out are assisted, fundamentally solving the problem of dropped and empty gears
4. The gear controller is located in the inner side of the rear fork arm, which is protected by the rear fork arm to avoid damage and failure due to bumping
5. Domestic and foreign patent pool protection, can continue to generate economic benefits
6. Strong applicability: can be shifted across gears, can be retrofitted with electronic control devices

Application scenarios:
Assist bicycle, bicycle, mountain bike, etc.