275/55 R21 tires diameter is 32.9 inches, section width is 10.8 inches and rim diameter is 21 inches.
Parameter | Meaning |
---|---|
275 | The first number shows that the tire has a width of 275 millimeters or approximately 10.8 inches. |
55 | The second number is the aspect ratio. In this case, it is 55%. It shows the height of the tire from the ground to rim edge, which is 55% of the width or ~ 152mm |
R21 | The letter R means this tire is radial. Most of all tires nowadays are radial. The number is the tire diameter in inches. It means that tire will fit 21 inch wheels |