255/45R22 tire size
A 255/45R22 tire is 31.04 inches (788.3 mm) tall, 10.04 in (255 mm) wide and fits a 22-inch wheel. In inch notation it is roughly a 31.0x10.0R22 — a "31-inch" tire.
| Overall diameter | 31.04 in | 788.3 mm |
|---|---|---|
| Section width | 10.04 in | 255 mm |
| Sidewall height | 4.52 in | 114.8 mm |
| Circumference | 97.50 in | 2,477 mm |
| Revolutions | 649.8 per mile | 403.8 per km |
| Rim diameter | 22 in | 558.8 mm |
Compare 255/45R22 with another size
Alternative sizes on the same 22-inch wheel
Sizes in use within ±3 % of the overall diameter of 255/45R22:
Plus and minus sizes for 255/45R22
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 255/55R20 | Minus 2 (20 in) | 31.04 in | +0.03% |
| 235/60R20 | Minus 2 (20 in) | 31.10 in | +0.22% |
| 285/50R20 | Minus 2 (20 in) | 31.22 in | +0.60% |
| 275/50R20 | Minus 2 (20 in) | 30.83 in | −0.67% |
| 255/50R21 | Minus 1 (21 in) | 31.04 in | +0.01% |
| 285/45R21 | Minus 1 (21 in) | 31.10 in | +0.20% |
| 275/45R21 | Minus 1 (21 in) | 30.74 in | −0.94% |
| 305/40R21 | Minus 1 (21 in) | 30.61 in | −1.38% |
| 255/40R23 | Plus 1 (23 in) | 31.03 in | −0.01% |
| 295/35R23 | Plus 1 (23 in) | 31.13 in | +0.30% |
| 285/35R23 | Plus 1 (23 in) | 30.85 in | −0.58% |
| 305/35R23 | Plus 1 (23 in) | 31.41 in | +1.19% |
Vehicles approved with 255/45R22 tires
Models whose Swiss type approval lists 255/45R22 as a standard or optional size (52 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 22-inch sizes
Reading the 255/45R22 size
- 255 — section width in millimetres (10.04 in).
- 45 — aspect ratio: the sidewall is 45 % of the width, 114.8 mm.
- R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
- 22 — fits a 22-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.