255/50R20 tire size
A 255/50R20 tire is 30.04 inches (763.0 mm) tall, 10.04 in (255 mm) wide and fits a 20-inch wheel. In inch notation it is roughly a 30.0x10.0R20 — a "30-inch" tire.
| Overall diameter | 30.04 in | 763.0 mm |
|---|---|---|
| Section width | 10.04 in | 255 mm |
| Sidewall height | 5.02 in | 127.5 mm |
| Circumference | 94.37 in | 2,397 mm |
| Revolutions | 671.4 per mile | 417.2 per km |
| Rim diameter | 20 in | 508.0 mm |
Compare 255/50R20 with another size
Alternative sizes on the same 20-inch wheel
Sizes in use within ±3 % of the overall diameter of 255/50R20:
Plus and minus sizes for 255/50R20
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 255/60R18 | Minus 2 (18 in) | 30.05 in | +0.03% |
| 235/65R18 | Minus 2 (18 in) | 30.03 in | −0.04% |
| 285/55R18 | Minus 2 (18 in) | 30.34 in | +1.01% |
| 245/60R18 | Minus 2 (18 in) | 29.57 in | −1.55% |
| 255/55R19 | Minus 1 (19 in) | 30.04 in | +0.01% |
| 235/60R19 | Minus 1 (19 in) | 30.10 in | +0.21% |
| 275/50R19 | Minus 1 (19 in) | 29.83 in | −0.71% |
| 265/55R19 | Minus 1 (19 in) | 30.48 in | +1.45% |
| 255/45R21 | Plus 1 (21 in) | 30.04 in | −0.01% |
| 285/40R21 | Plus 1 (21 in) | 29.98 in | −0.21% |
| 235/50R21 | Plus 1 (21 in) | 30.25 in | +0.71% |
| 295/40R21 | Plus 1 (21 in) | 30.29 in | +0.84% |
| 255/40R22 | Plus 2 (22 in) | 30.03 in | −0.03% |
| 295/35R22 | Plus 2 (22 in) | 30.13 in | +0.30% |
| 285/35R22 | Plus 2 (22 in) | 29.85 in | −0.62% |
| 265/40R22 | Plus 2 (22 in) | 30.35 in | +1.02% |
| 275/35R23 | Plus 3 (23 in) | 30.58 in | +1.80% |
| 285/35R23 | Plus 3 (23 in) | 30.85 in | +2.71% |
Vehicles approved with 255/50R20 tires
Models whose Swiss type approval lists 255/50R20 as a standard or optional size (1,346 approvals in total). Always check your own vehicle's placard or papers.
- Audi Q7
- Audi E-tron
- Jaguar F-Pace
- Land Rover Range Rover
- Audi SQ7
- SsangYong Rexton
- Land Rover Discovery
- Audi Q8
- Kg Mobility Rexton
- Cadillac SRX
- Audi SQ8
- Fisker Ocean
- Polestar 3
- XPeng G9
- Polestar 4
- Lotus Eletre
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
- 235/40R20 (−8.8%)
- 235/45R20 (−5.7%)
- 235/50R20 (−2.6%)
- 235/55R20 (+0.5%)
- 235/60R20 (+3.5%)
- 245/40R20 (−7.7%)
- 245/45R20 (−4.5%)
- 245/50R20 (−1.3%)
- 255/40R20 (−6.7%)
- 255/45R20 (−3.3%)
- 255/55R20 (+3.3%)
- 255/60R20 (+6.7%)
- 265/40R20 (−5.6%)
- 265/45R20 (−2.2%)
- 265/50R20 (+1.3%)
- 265/60R20 (+8.3%)
- 275/40R20 (−4.6%)
- 275/45R20 (−1.0%)
- 275/50R20 (+2.6%)
- 275/55R20 (+6.2%)
- 275/60R20 (+9.8%)
Reading the 255/50R20 size
- 255 — section width in millimetres (10.04 in).
- 50 — aspect ratio: the sidewall is 50 % of the width, 127.5 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.