285/45R18 tire size
A 285/45R18 tire is 28.10 inches (713.7 mm) tall, 11.22 in (285 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 28.1x11.2R18 — a "28-inch" tire.
| Overall diameter | 28.10 in | 713.7 mm |
|---|---|---|
| Section width | 11.22 in | 285 mm |
| Sidewall height | 5.05 in | 128.3 mm |
| Circumference | 88.27 in | 2,242 mm |
| Revolutions | 717.8 per mile | 446.0 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 285/45R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 285/45R18:
Plus and minus sizes for 285/45R18
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 255/55R17 | Minus 1 (17 in) | 28.04 in | −0.20% |
| 275/55R17 | Minus 1 (17 in) | 28.91 in | +2.89% |
| 255/45R19 | Plus 1 (19 in) | 28.04 in | −0.22% |
| 285/40R19 | Plus 1 (19 in) | 27.98 in | −0.43% |
| 295/40R19 | Plus 1 (19 in) | 28.29 in | +0.69% |
| 265/45R19 | Plus 1 (19 in) | 28.39 in | +1.04% |
| 295/35R20 | Plus 2 (20 in) | 28.13 in | +0.11% |
| 255/40R20 | Plus 2 (20 in) | 28.03 in | −0.24% |
| 335/30R20 | Plus 2 (20 in) | 27.91 in | −0.66% |
| 285/35R20 | Plus 2 (20 in) | 27.85 in | −0.87% |
| 255/35R21 | Plus 3 (21 in) | 28.03 in | −0.25% |
| 305/30R21 | Plus 3 (21 in) | 28.20 in | +0.38% |
| 295/30R21 | Plus 3 (21 in) | 27.97 in | −0.46% |
| 265/35R21 | Plus 3 (21 in) | 28.30 in | +0.73% |
Vehicles approved with 285/45R18 tires
Models whose Swiss type approval lists 285/45R18 as a standard or optional size (24 approvals in total). Always check your own vehicle's placard or papers.
Source: Swiss Federal Roads Office (FEDRO/ASTRA), open government data. Original data (downloaded 2026-09-29). Data processed by us; errors in processing are ours, not the publisher's.
Nearby 18-inch sizes
Reading the 285/45R18 size
- 285 — section width in millimetres (11.22 in).
- 45 — aspect ratio: the sidewall is 45 % of the width, 128.3 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.