What does 255/40R18 mean?
|The tire width is 255mm.|
|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.|
|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.
|Rim diameter for the tire.|
255/40R18 95W tire size
The width of 255/40R18 95W tire is stated in millimeters and sidewall height in percentages. In this table you’ll find out the 255/40R18 95W tire size in inches as well as few additional metrics:
|In inches||In millimeters|
Diameter / Height
|775 per mile||481 per kilometer|
Rim Size for 255/40R18 95W Tires
Recommended rim sizes for 255/40R18 95W tire:
What does 95W mean?
The load index 95 means that the tire has been designed to support 1521 lbs or 690 kg.
The speed index W means that the tire has been designed to be used in speed up to 168 mph or 270 kph.This size tire is usually used on performance vehicles.