255/75R15 tire size
A 255/75R15 tire is 30.06 inches (763.5 mm) tall, 10.04 in (255 mm) wide and fits a 15-inch wheel. In inch notation it is roughly a 30.1x10.0R15 — a "30-inch" tire.
| Overall diameter | 30.06 in | 763.5 mm |
|---|---|---|
| Section width | 10.04 in | 255 mm |
| Sidewall height | 7.53 in | 191.3 mm |
| Circumference | 94.43 in | 2,399 mm |
| Revolutions | 670.9 per mile | 416.9 per km |
| Rim diameter | 15 in | 381.0 mm |
Compare 255/75R15 with another size
Alternative sizes on the same 15-inch wheel
Sizes in use within ±3 % of the overall diameter of 255/75R15:
Plus and minus sizes for 255/75R15
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 255/70R16 | Plus 1 (16 in) | 30.06 in | −0.01% |
| 235/75R16 | Plus 1 (16 in) | 29.88 in | −0.60% |
| 245/75R16 | Plus 1 (16 in) | 30.47 in | +1.36% |
| 265/70R16 | Plus 1 (16 in) | 30.61 in | +1.82% |
| 255/65R17 | Plus 2 (17 in) | 30.05 in | −0.03% |
| 235/70R17 | Plus 2 (17 in) | 29.95 in | −0.35% |
| 245/70R17 | Plus 2 (17 in) | 30.50 in | +1.48% |
| 265/65R17 | Plus 2 (17 in) | 30.56 in | +1.68% |
| 255/60R18 | Plus 3 (18 in) | 30.05 in | −0.04% |
| 235/65R18 | Plus 3 (18 in) | 30.03 in | −0.10% |
| 285/55R18 | Plus 3 (18 in) | 30.34 in | +0.94% |
| 265/60R18 | Plus 3 (18 in) | 30.52 in | +1.53% |
Nearby 15-inch sizes
Reading the 255/75R15 size
- 255 — section width in millimetres (10.04 in).
- 75 — aspect ratio: the sidewall is 75 % of the width, 191.3 mm.
- R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
- 15 — fits a 15-inch diameter wheel.
The load index and speed rating (for example 91V) follow the size on the sidewall. They must meet at least the values on your vehicle's tire placard.