What does 255/45R18 mean?
|The tire width is 255mm.|
|The aspect ratio of the tire is 45. 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.|
255/45R18 103Y tire size
The width of 255/45R18 103Y tire is stated in millimeters and sidewall height in percentages. In this table you’ll find out the 255/45R18 103Y tire size in inches as well as few additional metrics:
|In inches||In millimeters|
Diameter / Height
|746 per mile||464 per kilometer|
Rim Size for 255/45R18 103Y Tires
Recommended rim sizes for 255/45R18 103Y tire:
What does 103Y mean?
The load index 103 means that the tire has been designed to support 1929 lbs or 875 kg.
The speed index Y means that the tire has been designed to be used in speed up to 186 mph or 300 kph.This size tire is usually used on high-performance cars.