285/65R18 tire size
A 285/65R18 tire is 32.59 inches (827.7 mm) tall, 11.22 in (285 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 32.6x11.2R18 — a "33-inch" tire.
| Overall diameter | 32.59 in | 827.7 mm |
|---|---|---|
| Section width | 11.22 in | 285 mm |
| Sidewall height | 7.29 in | 185.3 mm |
| Circumference | 102.37 in | 2,600 mm |
| Revolutions | 618.9 per mile | 384.6 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 285/65R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 285/65R18:
Plus and minus sizes for 285/65R18
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 285/75R16 | Minus 2 (16 in) | 32.83 in | +0.75% |
| 265/75R16 | Minus 2 (16 in) | 31.65 in | −2.88% |
| 285/70R17 | Minus 1 (17 in) | 32.71 in | +0.37% |
| 255/75R17 | Minus 1 (17 in) | 32.06 in | −1.62% |
| 255/65R19 | Plus 1 (19 in) | 32.05 in | −1.64% |
| 265/60R20 | Plus 2 (20 in) | 32.52 in | −0.21% |
| 285/55R20 | Plus 2 (20 in) | 32.34 in | −0.75% |
| 275/60R20 | Plus 2 (20 in) | 32.99 in | +1.24% |
| 255/60R20 | Plus 2 (20 in) | 32.05 in | −1.66% |
| 275/50R21 | Plus 3 (21 in) | 31.83 in | −2.33% |
Nearby 18-inch sizes
Reading the 285/65R18 size
- 285 — section width in millimetres (11.22 in).
- 65 — aspect ratio: the sidewall is 65 % of the width, 185.3 mm.
- R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
- 18 — fits a 18-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.