The hottest tires also have dual specifications. W

2022-10-24
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Tires also have dual specifications. What's the matter with the British metric system

Abstract: due to historical reasons, the British standard was introduced into China's early tire production technology, so the British standard was also used in the production of bias ply tires and later steel radial tires. In the era of truck tubeless tires, the British standard was still used

when buying tires, we card friends found that 12r22.5 was printed on the tires, while some tires were 295/80r22.5. What's the matter? Careful kayou also found that most of the tires of some imported cars are 295/80r22.5 tires, while most of our domestic trucks are equipped with 12r22.5 tires

everyone knows that 12r22.5 and 295/80r22.5 are about tubeless tire specifications, but many people don't understand what they mean. The tires look similar in size. Why do you have two specifications

due to historical reasons, the British standard was introduced into the early tire production technology in China, so the British standard was also used in the production of bias ply tires and later steel radial tires. In the era of truck tubeless tires, the British standard was still used. In Europe, metric tires are used in most countries, so imported vehicles are equipped with most metric tires. 7. Needle valve filling Cup group

● British tyre

12r22 joint application for aviation alloy powder project for 3D printing; Become a qualified supplier of AVIC 3 factory 51 to obtain accurate experimental results 5 is the British specification of the tire, which specifically means that the cross-sectional width of the tire is 12 inches (30.47 cm) meters. The rim diameter is 22.5 inches (57.1 cm)

in the context of popular science, we often say that feet and miles are British length units, while millimeters, centimeters and meters are metric length units

British tire specifications can only provide information about tire cross-section width, tire type, and mounting rim size. Compared with British specifications, metric tire specifications can provide more tire information, such as tire section width, flat ratio, and mounting rim size. Through the flat ratio, we can also calculate the tire section height

● metric tire

295/80r22.5 is the metric tire specification, which specifically means that the cross-sectional width of the tire is 29.5 cm, and 80 is the flat ratio of the tire. The diameter of the rim on which the tire is mounted is 22.5 inches (57.1 cm)

here we will focus on the flat ratio of metric tires. The flat ratio is also called the aspect ratio. The flat ratio is calculated by dividing the height of the tire's cross-section by the width of the tire's cross-section. At present, the common flat ratio of tires in China is 80. In addition to 80, there are 70 and 60. At present, the flat ratio of tires for the smallest civilian truck is known to be 45

take 295/80r22.5 tire as an example, the flat ratio is 80, that is, the ratio of tire cross-section height (tread to lip) to tire cross-section is 80%. If the fuel volume is too small, the testing machine cannot work normally. The height of the tire cross-section is equal to the cross-section width multiplied by the flat ratio, 29.5cm X80% =23.6cm, that is, the height of the tire cross-section is 23.6cm

through calculation, we can know 295/80r22.5 tire diameter, tire cross-sectional height (23.6cm) + rim diameter (57.1cm) + tire cross-sectional height (23.6cm) = tire diameter (104.3cm)

previous colleagues have also interpreted a lot about the interpretation of metric and British tire models. Interested card users can continue to click on "basic knowledge of tires, light and heavy truck tire models, second understanding" to view

through this article, I believe you have a certain understanding of the British and metric tire specifications. At present, truck tires in China are mainly in British specifications, but with the development of time, many metric tires have begun to appear on trucks. In the future, truck tires may be the same as car tires, all of which are metric specifications

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