Common knowledge of bicycle inner tube and matters needing attention

1. Size of bicycle inner tube

The size and specifications must match the tire. The tire wall will be marked with a πsize, such as 26×1.95 (26 refers to the wheel diameter, mou↓ntain bikes are generally 26 inches, children’s mountain bikes are generally♦ 24 inches, and 1.95 refers to the cross-sectional width)φ, For the words 700×23c, the inner tube should be selected according to the size  of the outer tube.

Generally, there is a suitable range for the size of the inner tube. For example, the inλner tube marked with 26×1.95～2.1 means that the inn≈er tube can be used with a 26-inch outer tube with a width in the range of ∞1.95～2.1.

2. Types and specifications of bicycle inner tube valves

The air nozzle should be selected in accordance with the rim. The size ♦of the air nozzle hole on the rim determines whether you use an American or French nozzβle. The thickness of the rim determines the choice of the ¶length of the air nozzle. Inner tube.

Common types of gas nozzles in the country include English-style mouths, American-style m₹ouths, and French-style mouths.

The original 26-inch and 28-inch cars we used for da♣ily riding were English-style mouths (E/V), which r¥equired a valve core rubber tube. The elastic materialσ I used to make slingshots when I was a kid was mostly English-style mouths. The valve core rubber ₩tube is made of:) Because the rubber tube is easy to age, resulting in poor air tightness and need₩s to be replaced frequently, at present sports bikes ra↔rely use British mouths.

French mouth (F/V) manual locking valve, high pressure resistance, smooth air ¶leakage linearity, thin air mouth foundation, light weight, smallα air mouth diameter, little influence on the strength of the ri♣ng, can be used in 19C size inner tube or Narrow cir≥cle, high price! It is the best airtightness under high pressure i<n several inner tubes. Road tires require high air pressure, so most of them use French &mouths. The French mouth is very small, and the holes in the rim are also very small, which& is conducive to the strength of the rim. The use of &French mouths for road vehicles may also be related to this. But it is alsΩo relatively fragile, I accidentally broke a few by accidλent.

The inner tubes of motorcycles we see basically use American mouth (A/V), s​o American mouth is also commonly known as motorcycle mouth. It is mainly locked by intern÷al pressure, high pressure resistance, and the leakage linearity is steep, that is t o say, the leakage is faster when the air pressure is insufficient, the bas®e of the air nozzle is large, the diameter of the air nozzle is also large, butβ the inflation flow is large, the air of the American nozzle The airtightness is better anλd the pumping is much more convenient than the French mouth, so it is most commonl§y used. Most mountain bikes use American mouths, and many low-end road bikes ✔are also equipped with American mouths. The American-style mouth is curr₽ently very convenient for pumping up in China. Most portable pumps can pump up the American-st$yle mouth, and can be pumped up in car repair booths and motorcycle repaδir offices. It is the most suitable for bicycle trips.

Gas nozzle length:

The length of the standard American mouth is 2.8cm, the length o​f the French mouth is 3.2mm, (the above number is not clear, please check back and make cor★rections if there is any mistake) We need to choose the appropriate l≠ength of air according to the thickness of the rim The mouth and the air noz♣zle protrude from the rim to part of the length for easy pumping.

3. Thickness of bicycle inner tube

Inner tubes of different thickness are suitable for✘ different situations. Taking Jianda as an example, the inner tube of gener al thickness is 0.87 mm. On this basis, there are also lightweight inner tubesδ with thicknesses of 0.73, 0.6, 0.45 mm, and thicknesses of 1.2, 2.25, and 4±.3 mm. Reinforced inner tube.

Lightweight inner tubes are mainly used for bicycle speed compe♥tition. Lightweight inner tubes can reduce the weight of whe•els turning. Because the thickness is reduced but the strength requirements are not small, th≤e price is more expensive than the ordinary thickness inn>er tube.

The reinforced inner tube is used for high-intensity use, suc÷h as high-strength mountain off-road, DH, BMX, etc., the ultra-thick π4.3mm inner tube is thin and thick inside, very thick and heavy, a∞nd it looks very confident that the tire will not burst.± It is simply a tire. Cyclists used to sell it, and they must have bo←ught it for bikers who are extremely tired of tire repair.

For general riding, we can use ordinary thickness or  a slightly thicker inner tube. Many riders don't understand it. They think that the expensi★ve one must be durable and it is wrong to buy lightweight 'inner tubes for travel purposes.

4. Bicycle inner tube material

The common ones are natural rubber and butyl rubber. Butylφ rubber is better than natural rubber in high temperatureλ resistance and delayed aging, and has a long servi<ce life. At the same time, the airtightness is also much better, so the middle an‌d high-end inner tubes basically use butyl rubber as th'e material. Generally, a few dollars at the car repair booth are natural rubber inner tubes, and ₩currently cyclists sell butyl rubber inner tubes.

5. Leakage repair liquid for bicycle inner tube (also called anti-leak'age liquid)

The inner tube leaking fluid can be purchased to infuse itself, or th©e inner tube that has been filled with the leaking fluid can be∑ purchased. Once a rider bought a leak-proof inner tube from the rider, and after a while, he pus©hed the car back and punctured the tire. He asked the mas£ter how to repair the leak-proof inner tube. In fact, the inner tube leakage repair fluid can onαly repair smaller holes automatically, and at the same time strengthen the air ti®ghtness of the inner tube, there is no way for the gener$al larger tire puncture.