There are three main elements in using a bicycle correctly.

1. Transmission. First, a few concepts about transmission:

① Gear ratio. The ratio of the number of teeth of the driving gear (wheel) to the passive gear (flywheel).

② Transmission ratio. The gear ratio multiplied by the diameter of the rear wheels of the car.

(3) Self-transmission stroke. Multiply the gear ratio by PI, the distance a rider can travel with each pedal. It doesn't matter what kind of bike it is, as long as it has a gearshift. The combination of wheels and flywheels in the transmission system, especially in mountain bikes, allows riders to maintain a certain pedal frequency and navigate a variety of difficult terrain. Proper use of the transmission can reduce maintenance frequency and extend its service life.

2, quick demolition, also known as the pull rod. Bicycle mainly has the front and rear axle and saddle insert rod with quick disassembly, its role is convenient, do not need to move the hand can be removed from the components. Slightly more upmarket sport bikes have quick detachable front and rear axles.

(I) Disassembling: button the quick disassembling handle with the finger of one hand and pull it 180° in the axial direction. The size of the pulling force is determined by the strength at the time of installation. Under normal circumstances, the strength should be relatively large, it takes some effort to pull it. There is a certain degree of "flexibility" in this effort, rather than pulling and pulling. With the other hand, rotate the nut at the other end to the loosening direction for several turns, and the wheel group can be easily removed.

Denominated in assembly: first make the quick release lever is in "open" state, with the wheels into the fork shaft groove on the shelf, tighten nut of quick release lever, at the same time pay attention to the position of the wheel is at the centre of the bicycle structure, extending the axial rotates in the opposite direction to the dismantlement of quick release handle 180 °, efforts shall be made in general men's palms can push when leave for last moderately. When assembling, attention should be paid to the direction of the quick disassembly handle. The quick disassembly handle of the front shaft should be basically parallel to the front fork, and the quick disassembly handle of the rear shaft should be between the horizontal pull fork and the inclined pull fork.

(iii) Inspection: After assembly, inspection shall be carried out to prevent accidents. Method is: if it is the front wheel, with the right hand holding the "handle force" will lift the front wheel, with the left hand clenched fist hit the upper part of the front wheel, no loosening is qualified. If it is the rear wheel, hold the rear end of the frame beam with your left hand, lift the rear wheel, and hit the upper part of the rear wheel with your right hand, without any loosening, it is qualified.

3. Tire pressure. We often inflate tires, but to what extent it is appropriate, many people do not know, often until the hand is no longer able to move. This is not true.

There is a fixed pressure in bicycle tires. The edge of the tire has a variety of parameters such as trademark, size and so on, and the parameters of the tire pressure are one of them. Generally speaking, the pressure of bicycle tires is measured in PSI. PSI is a British unit of atmospheric pressure per square inch. The air pressure on our mountain bikes is usually in the range of 40-65 psi. Pressure is too high, will increase the intensity of turbulence and the probability of puncture; The pressure is too small, will expand the contact area between the tire and the road surface, increase cycling resistance. Therefore, the gas should be charged to the upper limit (65PSI) of the marked value range. This is of great benefit to improve the comfort of cycling, maintain a certain cycling speed and reduce the probability of puncture.