Mountain bike originated in 1977. Scott, a student of the University of California, modified an ordinary bicycle. It is a model derived from driving a bicycle for pattern competition on the cross-country field of motorcycle competition. Later, it gradually formed a form of sports and became popular in Europe and America. The total length of the bicycle shall not exceed 185cm, the width shall not exceed 50cm, and the weight shall not be less than 6.8kg. The length of the seat should be between 24-30cm, the distance between the center axle and the ground should be between 24-30cm, and the diameter of the front and rear wheels of the bicycle must be the same. The diameter of the wheel is 70 cm maximum and 55 cm minimum. The bicycle used shall be a dead flywheel, and speed change devices and brakes shall not be installed. Because mountain bikes are laborious to drive, the frame of mountain bikes should be correspondingly smaller than that of ordinary bikes. This structure takes into account the characteristics of cross-country sports of bicycles. Bicycles are more convenient to operate on different ground. The material, structure and design style of the bicycle frame are very important for manufacturing an efficient, safe and reliable bicycle, because the bicycle frame needs to withstand the impact caused by various reasons. With the improvement of people's living standards, people pay more and more attention to physical health and outdoor sports. In order to meet the needs of different customers, we have prepared a variety of different types of mountain bikes for you to choose from. Welcome to contact us for more product details and services.