285/30R18 tire size
A 285/30R18 tire is 24.73 inches (628.2 mm) tall, 11.22 in (285 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 24.7x11.2R18.
| Overall diameter | 24.73 in | 628.2 mm |
|---|---|---|
| Section width | 11.22 in | 285 mm |
| Sidewall height | 3.37 in | 85.5 mm |
| Circumference | 77.70 in | 1,974 mm |
| Revolutions | 815.5 per mile | 506.7 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 285/30R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 285/30R18:
Plus and minus sizes for 285/30R18
Vehicles approved with 285/30R18 tires
Models whose Swiss type approval lists 285/30R18 as a standard or optional size (32 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 285/30R18 size
- 285 — section width in millimetres (11.22 in).
- 30 — aspect ratio: the sidewall is 30 % of the width, 85.5 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.