What do the numbers and letters on tires mean?

1 Answers
MacJoshua
07/29/25 1:24pm
The numbers and letters on tires, taking 225/45R17 as an example: Before the letter 'R', there are '45' and '225', where '45' represents the aspect ratio of the tire. The aspect ratio is the ratio between the tire's section height and section width; '225' represents the section width of the tire; '17' represents the diameter of the wheel rim; and 'R' indicates that it is a radial tire. Tires are circular elastic rubber products assembled on various vehicles or machinery for rolling on the ground. They are usually mounted on metal rims to support the vehicle body, cushion external impacts, ensure contact with the road surface, and guarantee the vehicle's driving performance.
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