285/50R20 tire size
A 285/50R20 tire is 31.22 inches (793.0 mm) tall, 11.22 in (285 mm) wide and fits a 20-inch wheel. In inch notation it is roughly a 31.2x11.2R20 — a "31-inch" tire.
| Overall diameter | 31.22 in | 793.0 mm |
|---|---|---|
| Section width | 11.22 in | 285 mm |
| Sidewall height | 5.61 in | 142.5 mm |
| Circumference | 98.08 in | 2,491 mm |
| Revolutions | 646.0 per mile | 401.4 per km |
| Rim diameter | 20 in | 508.0 mm |
Compare 285/50R20 with another size
Alternative sizes on the same 20-inch wheel
Sizes in use within ±3 % of the overall diameter of 285/50R20:
Plus and minus sizes for 285/50R20
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 255/65R18 | Minus 2 (18 in) | 31.05 in | −0.54% |
| 275/60R18 | Minus 2 (18 in) | 30.99 in | −0.73% |
| 285/60R18 | Minus 2 (18 in) | 31.46 in | +0.78% |
| 265/65R18 | Minus 2 (18 in) | 31.56 in | +1.10% |
| 255/60R19 | Minus 1 (19 in) | 31.05 in | −0.55% |
| 275/55R19 | Minus 1 (19 in) | 30.91 in | −1.00% |
| 265/55R19 | Minus 1 (19 in) | 30.48 in | −2.38% |
| 255/65R19 | Minus 1 (19 in) | 32.05 in | +2.66% |
| 325/40R21 | Plus 1 (21 in) | 31.24 in | +0.05% |
| 285/45R21 | Plus 1 (21 in) | 31.10 in | −0.39% |
| 255/50R21 | Plus 1 (21 in) | 31.04 in | −0.58% |
| 315/40R21 | Plus 1 (21 in) | 30.92 in | −0.96% |
| 295/40R22 | Plus 2 (22 in) | 31.29 in | +0.23% |
| 255/45R22 | Plus 2 (22 in) | 31.04 in | −0.59% |
| 285/40R22 | Plus 2 (22 in) | 30.98 in | −0.78% |
| 325/35R22 | Plus 2 (22 in) | 30.96 in | −0.84% |
| 295/35R23 | Plus 3 (23 in) | 31.13 in | −0.29% |
| 305/35R23 | Plus 3 (23 in) | 31.41 in | +0.59% |
| 255/40R23 | Plus 3 (23 in) | 31.03 in | −0.61% |
| 285/35R23 | Plus 3 (23 in) | 30.85 in | −1.17% |
Vehicles approved with 285/50R20 tires
Models whose Swiss type approval lists 285/50R20 as a standard or optional size (15 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 20-inch sizes
Reading the 285/50R20 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).
- 20 — fits a 20-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.