285/45R20 tire size
A 285/45R20 tire is 30.10 inches (764.5 mm) tall, 11.22 in (285 mm) wide and fits a 20-inch wheel. In inch notation it is roughly a 30.1x11.2R20 — a "30-inch" tire.
| Overall diameter | 30.10 in | 764.5 mm |
|---|---|---|
| Section width | 11.22 in | 285 mm |
| Sidewall height | 5.05 in | 128.3 mm |
| Circumference | 94.56 in | 2,402 mm |
| Revolutions | 670.1 per mile | 416.4 per km |
| Rim diameter | 20 in | 508.0 mm |
Compare 285/45R20 with another size
Alternative sizes on the same 20-inch wheel
Sizes in use within ±3 % of the overall diameter of 285/45R20:
Plus and minus sizes for 285/45R20
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 255/60R18 | Minus 2 (18 in) | 30.05 in | −0.17% |
| 285/55R18 | Minus 2 (18 in) | 30.34 in | +0.81% |
| 265/60R18 | Minus 2 (18 in) | 30.52 in | +1.40% |
| 285/50R18 | Minus 2 (18 in) | 29.22 in | −2.92% |
| 255/55R19 | Minus 1 (19 in) | 30.04 in | −0.18% |
| 275/50R19 | Minus 1 (19 in) | 29.83 in | −0.90% |
| 265/55R19 | Minus 1 (19 in) | 30.48 in | +1.26% |
| 295/45R19 | Minus 1 (19 in) | 29.45 in | −2.15% |
| 255/45R21 | Plus 1 (21 in) | 30.04 in | −0.21% |
| 285/40R21 | Plus 1 (21 in) | 29.98 in | −0.41% |
| 295/40R21 | Plus 1 (21 in) | 30.29 in | +0.64% |
| 265/45R21 | Plus 1 (21 in) | 30.39 in | +0.97% |
| 295/35R22 | Plus 2 (22 in) | 30.13 in | +0.10% |
| 255/40R22 | Plus 2 (22 in) | 30.03 in | −0.22% |
| 285/35R22 | Plus 2 (22 in) | 29.85 in | −0.81% |
| 265/40R22 | Plus 2 (22 in) | 30.35 in | +0.82% |
| 315/30R23 | Plus 3 (23 in) | 30.44 in | +1.14% |
| 275/35R23 | Plus 3 (23 in) | 30.58 in | +1.60% |
| 325/30R23 | Plus 3 (23 in) | 30.68 in | +1.92% |
| 285/35R23 | Plus 3 (23 in) | 30.85 in | +2.51% |
Vehicles approved with 285/45R20 tires
Models whose Swiss type approval lists 285/45R20 as a standard or optional size (1,266 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
- 265/35R20 (−9.3%)
- 265/40R20 (−5.8%)
- 265/45R20 (−2.4%)
- 265/50R20 (+1.1%)
- 275/35R20 (−8.4%)
- 275/40R20 (−4.8%)
- 275/45R20 (−1.2%)
- 275/50R20 (+2.4%)
- 275/55R20 (+6.0%)
- 285/35R20 (−7.5%)
- 285/40R20 (−3.7%)
- 285/50R20 (+3.7%)
- 285/55R20 (+7.5%)
- 295/35R20 (−6.5%)
- 295/40R20 (−2.7%)
- 295/45R20 (+1.2%)
- 305/35R20 (−5.6%)
- 305/40R20 (−1.6%)
- 305/55R20 (+10.3%)
Reading the 285/45R20 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).
- 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.