Classification of children's self-induced errors:

1. According to the wheel size, there are three types of children's bicycles: 12 inches, 14 inches and 16 inches. There are larger sizes, of course, but they are no longer children's bikes.

2. According to the material of the tire, it can be divided into two kinds: ordinary inflatable rubber tire and solid tire. Solid tires are commonly used on children's bikes of 12 inches or smaller.

3. According to different functions, it can be divided into sliding scooter, ordinary children's bicycle, folding children's bicycle and electric children's bicycle.