285/50R18 tire size
A 285/50R18 tire is 29.22 inches (742.2 mm) tall, 11.22 in (285 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 29.2x11.2R18 — a "29-inch" tire.
| Overall diameter | 29.22 in | 742.2 mm |
|---|---|---|
| Section width | 11.22 in | 285 mm |
| Sidewall height | 5.61 in | 142.5 mm |
| Circumference | 91.80 in | 2,332 mm |
| Revolutions | 690.2 per mile | 428.9 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 285/50R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 285/50R18:
Plus and minus sizes for 285/50R18
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 255/65R16 | Minus 2 (16 in) | 29.05 in | −0.58% |
| 255/70R16 | Minus 2 (16 in) | 30.06 in | +2.86% |
| 255/60R17 | Minus 1 (17 in) | 29.05 in | −0.59% |
| 275/55R17 | Minus 1 (17 in) | 28.91 in | −1.06% |
| 255/65R17 | Minus 1 (17 in) | 30.05 in | +2.84% |
| 285/45R19 | Plus 1 (19 in) | 29.10 in | −0.42% |
| 255/50R19 | Plus 1 (19 in) | 29.04 in | −0.62% |
| 265/50R19 | Plus 1 (19 in) | 29.43 in | +0.73% |
| 295/45R19 | Plus 1 (19 in) | 29.45 in | +0.79% |
| 295/40R20 | Plus 2 (20 in) | 29.29 in | +0.24% |
| 265/45R20 | Plus 2 (20 in) | 29.39 in | +0.58% |
| 255/45R20 | Plus 2 (20 in) | 29.04 in | −0.63% |
| 285/40R20 | Plus 2 (20 in) | 28.98 in | −0.84% |
| 295/35R21 | Plus 3 (21 in) | 29.13 in | −0.31% |
| 265/40R21 | Plus 3 (21 in) | 29.35 in | +0.43% |
| 305/35R21 | Plus 3 (21 in) | 29.41 in | +0.63% |
| 255/40R21 | Plus 3 (21 in) | 29.03 in | −0.65% |
Vehicles approved with 285/50R18 tires
Models whose Swiss type approval lists 285/50R18 as a standard or optional size (13 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 285/50R18 size
- 285 — section width in millimetres (11.22 in).
- 50 — aspect ratio: the sidewall is 50 % of the width, 142.5 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.