275/65R18 tire size
A 275/65R18 tire is 275 mm wide with a sidewall 65% of its width (178.8 mm), fits a 18-inch rim and has an overall diameter of 815 mm (32.1 in).
| Dimension | Metric | Imperial |
|---|---|---|
| Section width | 275 mm | 10.83 in |
| Sidewall height | 178.8 mm | 7.04 in |
| Rim diameter | 457.2 mm | 18 in |
| Overall diameter | 814.7 mm | 32.07 in |
| Circumference | 2,559.5 mm | 100.77 in |
| Revolutions | 391 per km | 629 per mile |
Reading the size 275/65R18
275Width in mm65Aspect ratio (sidewall % of width)RRadial construction18Rim diameter in inches
The load index and speed rating (for example 91V) follow the size on the sidewall. Replacement tires should match or exceed the original load index and speed rating.
Alternative sizes within 3% of 275/65R18
A replacement size should stay within about 3% of the original diameter so the speedometer, ABS and transmission stay accurate. Always check clearance, load index and the vehicle manufacturer's approved sizes.
Compare 275/65R18 with any size →