Use a metal tape measure to circle the tire along the centerline of the tire crown or the highest point near the centerline, and measure the outer circumference. Select the sidewall part without marks, decorative lines and anti chafing lines, and measure the section width of four points at about four quarters of the tire circumference with vernier calipers or calipers. Finally, calculate the data.
The tire specification, model and size, expressed in mm as the percentage of section width and flat ratio. Add: tire type code, rim diameter (inch), load index (allowable load bearing mass code), and allowable vehicle speed code. Assume that the tire size is r
- The tire width is m.
- It refers to the tire flatness ratio, that is, the section height is width.
R - refers to that the tire is a radial tire (the inner layer of this tire is made of radial tire)
- refers to the rim diameter in inches.
- The maximum load capacity of the load index table. What are the four tires? Jin.
V - refers to the speed level of li/h.