185/55R15 tire size
A 185/55R15 tire is 185 mm wide with a sidewall 55% of its width (101.8 mm), fits a 15-inch rim and has an overall diameter of 584 mm (23.0 in).
| Dimension | Metric | Imperial |
|---|---|---|
| Section width | 185 mm | 7.28 in |
| Sidewall height | 101.8 mm | 4.01 in |
| Rim diameter | 381.0 mm | 15 in |
| Overall diameter | 584.5 mm | 23.01 in |
| Circumference | 1,836.3 mm | 72.29 in |
| Revolutions | 545 per km | 876 per mile |
Reading the size 185/55R15
185Width in mm55Aspect ratio (sidewall % of width)RRadial construction15Rim 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 185/55R15
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 185/55R15 with any size →