Bicycle Knowledge Lecture Notes: Zou Zhuo Steel Editor: Indians have established in June 1995. At present, the national bicycle movement is relatively high, and Northeast is relatively high, and Shenzhen is also the forefront of the country, especially in terms of equipment. The first bicycle classification one. Mountain bike features: for conquering various terrain design, the frame is strong; the car is generally 26 inches; the tires are coarse; the flat or swallows are generally configured. two. Highway car features: designed for speed, the car is 700c specification; the tires are fine, and the fetal caught. three. BMX climbing truck characteristics: designed to express the skill, the frame is stable, the tire width without teeth, the car can rotate 360 degrees, small in the diameter and extremely operability. Suitable for young people to play not detail. The second tire one. Mountain tire characteristics: tires, good stability, low tire pressure, generally 1.5, 1.95 and 2.1 specification, due to different purposes into rotten mud, sand tires, feature the fetal width, deep teeth; It is characterized by a small part of the tire in contact with a small part of the tire, and when riding on the earth, the teeth on both sides can stabilize the vehicle; the tire tire, the characteristics are small, suitable for highway riding. two. The highway tire is fine, the tire pressure is high; generally there are 25C, 23C, 20C, 18C, etc., 25c and 23c suitable for training, not easy to puncture, 20C and 18C resistance to the game. The third truck puts one. Mountain bikes are generally flattened or swallows. The advantage is that the hands are relatively wide, which is conducive to manipulation; where Swallows can raise the upper body, so that the gravity is moved, it is more suitable for the mountain. The disadvantage is that the wind is big. two. The road vehicle road vehicle generally comes with the sheep corner, there are 44cm and 42cm and other width specifications, suitable for their width is wide, which is characterized by reducing the wind resistance while suitable for a long time. The fourth-quarter shock absorbing system is divided into a pre-shock absorber and post-shock absorber, which can make the ride more comfortable, especially the next mountain cars, is an indispensable component; but there is a "diarrhea" for riding in the mountain and the ride. Adverse effects, if the shock absorbing system is locked, it will make the car's adaptability is stronger. For Shenzhen's road conditions, it is recommended to match the front. The function of the fifth variable speed system is to use different gear ratios between the tooth plate and the flywheel to accommodate different driving torque to accommodate different road conditions and the physical condition of the rider. One. The mountain bike is generally a three-piece gear, with 44 (42), 34 (34), 28 (24) a tooth; a 7-10 pieces, 11-28 (34) teeth, respectively. two. The road car generally the tooth plate is two gears, with 52 (54), 42 (39) tooth; after the 8-10 pieces of gears, 11-25 teeth, respectively. The sixth brake system road car is generally clamped, and the mountain bike is divided into three kinds of hanging, V-system and discs. The most commonly used V-system and disc. The advantage of V system is cheap, light, and the brake effect is good. It is simple to have. The disadvantage is that the weight is large, the price is expensive, the structure is complicated, and the maintenance is difficult. It is easy to hold the wheel.
