275/65R18 tire size
A 275/65R18 tire is 32.07 inches (814.7 mm) tall, 10.83 in (275 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 32.1x10.8R18 — a "32-inch" tire.
| Overall diameter | 32.07 in | 814.7 mm |
|---|---|---|
| Section width | 10.83 in | 275 mm |
| Sidewall height | 7.04 in | 178.8 mm |
| Circumference | 100.77 in | 2,559 mm |
| Revolutions | 628.8 per mile | 390.7 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 275/65R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 275/65R18:
Plus and minus sizes for 275/65R18
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 265/75R16 | Minus 2 (16 in) | 31.65 in | −1.33% |
| 285/75R16 | Minus 2 (16 in) | 32.83 in | +2.36% |
| 275/70R16 | Minus 2 (16 in) | 31.16 in | −2.86% |
| 255/75R17 | Minus 1 (17 in) | 32.06 in | −0.05% |
| 265/70R17 | Minus 1 (17 in) | 31.61 in | −1.46% |
| 285/65R17 | Minus 1 (17 in) | 31.59 in | −1.52% |
| 245/75R17 | Minus 1 (17 in) | 31.47 in | −1.89% |
| 255/65R19 | Plus 1 (19 in) | 32.05 in | −0.07% |
| 255/60R20 | Plus 2 (20 in) | 32.05 in | −0.09% |
| 275/55R20 | Plus 2 (20 in) | 31.91 in | −0.52% |
| 285/55R20 | Plus 2 (20 in) | 32.34 in | +0.83% |
| 265/60R20 | Plus 2 (20 in) | 32.52 in | +1.39% |
| 275/50R21 | Plus 3 (21 in) | 31.83 in | −0.77% |
| 245/55R21 | Plus 3 (21 in) | 31.61 in | −1.45% |
| 325/40R21 | Plus 3 (21 in) | 31.24 in | −2.61% |
Nearby 18-inch sizes
Reading the 275/65R18 size
- 275 — section width in millimetres (10.83 in).
- 65 — aspect ratio: the sidewall is 65 % of the width, 178.8 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.