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How to buy bicycle inner tube

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  • Time of issue:2020-06-18
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(Summary description)Common knowledge of bicycle inner tube and matters needing attention

How to buy bicycle inner tube

(Summary description)Common knowledge of bicycle inner tube and matters needing attention

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-06-18
  • Views:0
Information

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 size, such as 26×1.95 (26 refers to the wheel diameter, mountain bikes are generally 26 inches, children’s mountain bikes are generally 24 inches, and 1.95 refers to the cross-sectional width), 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 inner tube marked with 26×1.95~2.1 means that the inner 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 nozzle. 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 mouths, and French-style mouths.

The original 26-inch and 28-inch cars we used for daily riding were English-style mouths (E/V), which required a valve core rubber tube. The elastic material 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 needs to be replaced frequently, at present sports bikes rarely use British mouths.

French mouth (F/V) manual locking valve, high pressure resistance, smooth air leakage linearity, thin air mouth foundation, light weight, small air mouth diameter, little influence on the strength of the ring, can be used in 19C size inner tube or Narrow circle, high price! It is the best airtightness under high pressure in 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 also relatively fragile, I accidentally broke a few by accident.

The inner tubes of motorcycles we see basically use American mouth (A/V), so American mouth is also commonly known as motorcycle mouth. It is mainly locked by internal pressure, high pressure resistance, and the leakage linearity is steep, that is to say, the leakage is faster when the air pressure is insufficient, the base of the air nozzle is large, the diameter of the air nozzle is also large, but the inflation flow is large, the air of the American nozzle The airtightness is better and the pumping is much more convenient than the French mouth, so it is most commonly used. Most mountain bikes use American mouths, and many low-end road bikes are also equipped with American mouths. The American-style mouth is currently very convenient for pumping up in China. Most portable pumps can pump up the American-style mouth, and can be pumped up in car repair booths and motorcycle repair offices. It is the most suitable for bicycle trips.

Gas nozzle length:

The length of the standard American mouth is 2.8cm, the length of the French mouth is 3.2mm, (the above number is not clear, please check back and make corrections if there is any mistake) We need to choose the appropriate length of air according to the thickness of the rim The mouth and the air nozzle 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 general thickness is 0.87 mm. On this basis, there are also lightweight inner tubes 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 competition. Lightweight inner tubes can reduce the weight of wheels turning. Because the thickness is reduced but the strength requirements are not small, the price is more expensive than the ordinary thickness inner tube.

The reinforced inner tube is used for high-intensity use, such as high-strength mountain off-road, DH, BMX, etc., the ultra-thick 4.3mm inner tube is thin and thick inside, very thick and heavy, and it looks very confident that the tire will not burst. It is simply a tire. Cyclists used to sell it, and they must have bought 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 expensive 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. Butyl rubber is better than natural rubber in high temperature resistance and delayed aging, and has a long service life. At the same time, the airtightness is also much better, so the middle and high-end inner tubes basically use butyl rubber as the 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-leakage liquid)

The inner tube leaking fluid can be purchased to infuse itself, or the 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 pushed the car back and punctured the tire. He asked the master how to repair the leak-proof inner tube. In fact, the inner tube leakage repair fluid can only repair smaller holes automatically, and at the same time strengthen the air tightness of the inner tube, there is no way for the general larger tire puncture.

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