The reasons are as follows:
1. If the welding point of the frame is broken or there is a weak weld, it will cause abnormal noise when riding the electric vehicle. This problem is relatively Danger. Once the speed increases, the frame may break.
2. Abnormal noise caused by brake failure, such as brake pads falling off, brake springs breaking, brake lines rusting and not returning, screws fixing the brakes loose, brake rocker arms rusting, etc. All are sources of abnormal noise.
3. The bearings are worn or the balls are ruptured. The bearings carry the rotation of faucets, hubs and other components. Frequent friction can easily cause damage. The friction increases and noise occurs. In severe cases, the steel balls fall off and the coils are cut off and scrapped.
4. After being invaded by rain or mud, the flywheel will rust and make abnormal noises. If the flywheel is not maintained regularly, the riding noise will be loud after rusting.