Many people think that installing the piston rings of a motorcycle is very simple, just plug them in in order. It is estimated that after reading this sentence, some people start to curl their lips. This is very simple. I have been repairing cars for more than ten years, and they have been plugged i

The quality of the helmet - the material of the helmet shell shell1. The most common is ABS resin material, such as Taiwan brand Chi Mei. This is an engineering plastic with strong impact resistance and good dimensional stability. The market price of this material helmet: usually a full helmet is be

Venue facilitiesThe BMX arena consists of straights, corners and multiple obstacles. Measured along the centerline of the track, the length of the track shall not be less than 300 meters and shall not exceed 400 meters. The width of the starting section of the track is not less than 10 meters, and t

BMX emerged in California in the 1960s as an extreme sport.In the 1970s, the United States established the earliest BMX organization, which is also considered to be the symbol of BMX becoming an official sports event.In April 1981, the International BMX Alliance was formally established, and Europea