285/55R20 tire size
A 285/55R20 tire is 32.34 inches (821.5 mm) tall, 11.22 in (285 mm) wide and fits a 20-inch wheel. In inch notation it is roughly a 32.3x11.2R20 — a "32-inch" tire.
| Overall diameter | 32.34 in | 821.5 mm |
|---|---|---|
| Section width | 11.22 in | 285 mm |
| Sidewall height | 6.17 in | 156.8 mm |
| Circumference | 101.61 in | 2,581 mm |
| Revolutions | 623.6 per mile | 387.5 per km |
| Rim diameter | 20 in | 508.0 mm |
Compare 285/55R20 with another size
Alternative sizes on the same 20-inch wheel
Sizes in use within ±3 % of the overall diameter of 285/55R20:
Plus and minus sizes for 285/55R20
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 285/65R18 | Minus 2 (18 in) | 32.59 in | +0.75% |
| 265/70R18 | Minus 2 (18 in) | 32.61 in | +0.82% |
| 275/65R18 | Minus 2 (18 in) | 32.07 in | −0.83% |
| 255/70R18 | Minus 2 (18 in) | 32.06 in | −0.89% |
| 255/65R19 | Minus 1 (19 in) | 32.05 in | −0.90% |
| 275/50R21 | Plus 1 (21 in) | 31.83 in | −1.59% |
| 325/40R22 | Plus 2 (22 in) | 32.24 in | −0.33% |
| 285/45R22 | Plus 2 (22 in) | 32.10 in | −0.75% |
| 305/45R22 | Plus 2 (22 in) | 32.81 in | +1.44% |
| 275/50R22 | Plus 2 (22 in) | 32.83 in | +1.50% |
| 285/40R23 | Plus 3 (23 in) | 31.98 in | −1.13% |
| 325/35R23 | Plus 3 (23 in) | 31.96 in | −1.19% |
| 275/40R23 | Plus 3 (23 in) | 31.66 in | −2.11% |
| 305/35R23 | Plus 3 (23 in) | 31.41 in | −2.90% |
Nearby 20-inch sizes
Reading the 285/55R20 size
- 285 — section width in millimetres (11.22 in).
- 55 — aspect ratio: the sidewall is 55 % of the width, 156.8 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.