275/55R20 tire size
A 275/55R20 tire is 31.91 inches (810.5 mm) tall, 10.83 in (275 mm) wide and fits a 20-inch wheel. In inch notation it is roughly a 31.9x10.8R20 — a "32-inch" tire.
| Overall diameter | 31.91 in | 810.5 mm |
|---|---|---|
| Section width | 10.83 in | 275 mm |
| Sidewall height | 5.95 in | 151.3 mm |
| Circumference | 100.25 in | 2,546 mm |
| Revolutions | 632.0 per mile | 392.7 per km |
| Rim diameter | 20 in | 508.0 mm |
Compare 275/55R20 with another size
Alternative sizes on the same 20-inch wheel
Sizes in use within ±3 % of the overall diameter of 275/55R20:
Plus and minus sizes for 275/55R20
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 255/70R18 | Minus 2 (18 in) | 32.06 in | +0.46% |
| 275/65R18 | Minus 2 (18 in) | 32.07 in | +0.52% |
| 265/65R18 | Minus 2 (18 in) | 31.56 in | −1.09% |
| 285/60R18 | Minus 2 (18 in) | 31.46 in | −1.39% |
| 255/65R19 | Minus 1 (19 in) | 32.05 in | +0.44% |
| 255/60R19 | Minus 1 (19 in) | 31.05 in | −2.70% |
| 275/50R21 | Plus 1 (21 in) | 31.83 in | −0.26% |
| 245/55R21 | Plus 1 (21 in) | 31.61 in | −0.94% |
| 325/40R21 | Plus 1 (21 in) | 31.24 in | −2.11% |
| 285/45R21 | Plus 1 (21 in) | 31.10 in | −2.54% |
| 275/45R22 | Plus 2 (22 in) | 31.74 in | −0.52% |
| 285/45R22 | Plus 2 (22 in) | 32.10 in | +0.59% |
| 305/40R22 | Plus 2 (22 in) | 31.61 in | −0.95% |
| 325/40R22 | Plus 2 (22 in) | 32.24 in | +1.02% |
| 325/35R23 | Plus 3 (23 in) | 31.96 in | +0.15% |
| 285/40R23 | Plus 3 (23 in) | 31.98 in | +0.21% |
| 275/40R23 | Plus 3 (23 in) | 31.66 in | −0.78% |
| 305/35R23 | Plus 3 (23 in) | 31.41 in | −1.58% |
Vehicles approved with 275/55R20 tires
Models whose Swiss type approval lists 275/55R20 as a standard or optional size (132 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 275/55R20 size
- 275 — section width in millimetres (10.83 in).
- 55 — aspect ratio: the sidewall is 55 % of the width, 151.3 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.