wholesale jewelry gift wrap What does XC mean? Intersection Intersection

jewelry gift boxes wholesale amazon Cross -country bicycles. rn1888年，爱尔兰的兽医邓洛普，从医治牛胃气膨胀中得到启示，他把家中花园里用来浇水的橡胶管粘成圆形，打足了气，装在自行车轮子上，前往Participating in a bicycle competition, it actually ranked among the best, which caused great interest in people. Furious tires are an epoch -making initiative in the history of bicycle development.
It increases the elasticity of the bicycle and will not shock due to unevenness of the road. At the same time, it greatly increases the speed of driving and increases the friction between the wheel and the pavement. In this way, the cycling performance of the bicycle is fundamentally changed and the use of the bicycle use function.
Modern prototype:

The truly modern bicycle was born in 1874. In the year in 1874, the British Luo Song was ingeniously installed on the bicycle chain and sprocket on the bicycle, and used the rotation of the rear wheel to push the car forward. However, it is still large in front, small in the rear wheels, and it does not seem to be coordinated and unstable.
In 1886, John K. Starley, Britain, is a mechanical engineer. From the perspective of mechanics and sports, a new bicycle style is designed. The size of the wheels is the same to maintain a balance, and it is controlled by steel to become a diamond frame. The rubber wheel is also used for the first time. Stali not only improved the structure of the bicycle.
The above reference: Baidu Encyclopedia-Bicycle

silver for jewelry making wholesale XC, the official statement is on the one hand. In fact, in the bicycle circle, XC can be interpreted as X-Cross, and the limit crossing, which is from one point to another. It is necessary to consider the signal light. The most famous example is the requirements of the American bicycle courier. The requirements of the car. To ensure that the first foot kicking down is fast, it is best to be the hard tail of 26, the soft tail speed is weak, and the steering flexibility of 29 is insufficient.