What does 255/40R21 mean?
|
255 |
The tire width is 255mm. |
|
40 |
The aspect ratio of the tire is 40. Aspect ratio is the relative height of tire sidewall. The number refers to the percentage of sidewall height in relation to tire width. |
|
R |
The letter in the middle refers to tire construction. Practically all tires sold for cars are radials.
Sometimes you also see tires with RF or ZR. RF indicates the tire is run flat, whereas ZR means the tire has speed rating higher than V. These tires are also radials, as the R indicates. |
|
21 |
Rim diameter for the tire. |
255/40R21 102V tire size
The width of 255/40R21 102V tire is stated in millimeters and sidewall height in percentages. In this table you’ll find out the 255/40R21 102V tire size in inches as well as few additional metrics:
|
|
In inches | In millimeters |
|
Section Width |
10.0″ | 255mm |
|
Sidewall height |
4.0″ | 102mm |
|
Diameter / Height |
29.0″ | 737mm |
|
Circumference |
91.2″ | 2317mm |
|
Rim Diameter |
21″ | |
|
Revolutions |
695 per mile | 432 per kilometer |
Rim Size for 255/40R21 102V Tires
Recommended rim sizes for 255/40R21 102V tire:
| Diameter | Width Range |
| 21″ | 8.5-10″ |
What does 102V mean?
The load index 102 means that the tire has been designed to support 1874 lbs or 850 kg.
The speed index V means that the tire has been designed to be used in speed up to 149 mph or 240 kph.
This size tire is usually used for high-performance vehicles.