255/70R17 tire size
A 255/70R17 tire is 31.06 inches (788.8 mm) tall, 10.04 in (255 mm) wide and fits a 17-inch wheel. In inch notation it is roughly a 31.1x10.0R17 — a "31-inch" tire.
| Overall diameter | 31.06 in | 788.8 mm |
|---|---|---|
| Section width | 10.04 in | 255 mm |
| Sidewall height | 7.03 in | 178.5 mm |
| Circumference | 97.56 in | 2,478 mm |
| Revolutions | 649.4 per mile | 403.5 per km |
| Rim diameter | 17 in | 431.8 mm |
Compare 255/70R17 with another size
Alternative sizes on the same 17-inch wheel
Sizes in use within ±3 % of the overall diameter of 255/70R17:
Plus and minus sizes for 255/70R17
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 275/70R16 | Minus 1 (16 in) | 31.16 in | +0.33% |
| 235/80R16 | Minus 1 (16 in) | 30.80 in | −0.81% |
| 265/70R16 | Minus 1 (16 in) | 30.61 in | −1.45% |
| 245/75R16 | Minus 1 (16 in) | 30.47 in | −1.89% |
| 255/65R18 | Plus 1 (18 in) | 31.05 in | −0.01% |
| 275/60R18 | Plus 1 (18 in) | 30.99 in | −0.20% |
| 285/60R18 | Plus 1 (18 in) | 31.46 in | +1.32% |
| 265/65R18 | Plus 1 (18 in) | 31.56 in | +1.64% |
| 255/60R19 | Plus 2 (19 in) | 31.05 in | −0.03% |
| 235/65R19 | Plus 2 (19 in) | 31.03 in | −0.09% |
| 275/55R19 | Plus 2 (19 in) | 30.91 in | −0.47% |
| 265/55R19 | Plus 2 (19 in) | 30.48 in | −1.86% |
| 255/55R20 | Plus 3 (20 in) | 31.04 in | −0.04% |
| 235/60R20 | Plus 3 (20 in) | 31.10 in | +0.15% |
| 285/50R20 | Plus 3 (20 in) | 31.22 in | +0.53% |
| 275/50R20 | Plus 3 (20 in) | 30.83 in | −0.74% |
Nearby 17-inch sizes
Reading the 255/70R17 size
- 255 — section width in millimetres (10.04 in).
- 70 — aspect ratio: the sidewall is 70 % of the width, 178.5 mm.
- R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
- 17 — fits a 17-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.