The 255/50R20 is a common tire size for SUVs and crossovers such as Toyota RAV4, Honda CR-V, and Ford Explorer.
With a 127.5 mm sidewall (50% aspect ratio), this tire offers a balanced blend of ride comfort and handling precision — versatile for both city driving and spirited cornering.
Compared to the baseline 265/50R20, this tire's overall diameter differs by -1.3% — a speedometer calibrated for 265/50R20 would read 101.3 km/h at an actual 100 km/h.
When replacing, verify that your wheel well can accommodate the 763.0 mm overall diameter. Keep speedometer deviation within ±3% for safety and legal compliance.
| Tire Code | 255/50R20 |
| Section Width | 255 mm |
| Aspect Ratio | 50% |
| Rim Diameter | 20" |
| Sidewall Height | 127.5 mm |
| Overall Diameter | 763.0 mm / 30.04" |
| Circumference | 2397.0 mm / 94.37" |
| Revolutions per km | 417.2 |
| Revolutions per mile | 671.4 |
| Tire Code | OD (mm) | Δ mm | Δ % | Speedo at 100 km/h |
|---|---|---|---|---|
| 255/45R20 | 737.5 | -25.5 | -3.3% | 103.5 |
| 255/50R19 | 737.6 | -25.4 | -3.3% | 103.4 |
| 255/50R20 (current) | 763.0 | — | — | 100.0 |
| 265/50R20 | 773.0 | +10.0 | +1.3% | 98.7 |