1. Size: 13x8.5x9.5cm. 2. Weight: 0.25kg. 3. Material: aluminum alloy. 4. Applicable models: motorcycles, electric vehicles, scooters. 5. Features: It has a safety brake adjustment system with the advantages of non-slip, anti-lock, etc., avoiding out-of-control direction and vehicle side slip during emergency braking, so that the vehicle maintains a smooth linear deceleration while braking, which is shorter than the internationally prescribed braking distance. About 30, and because the wheel is not easy to tire, can greatly improve the life of the tire. Provides a more secure guarantee for all major users.