The 255/45R19 is a common tire size for SUVs and crossovers such as Toyota RAV4, Honda CR-V, and Ford Explorer.
With a 114.8 mm sidewall (45% 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 245/40R19, this tire's overall diameter differs by +4.9% — a speedometer calibrated for 245/40R19 would read 95.3 km/h at an actual 100 km/h.
When replacing, verify that your wheel well can accommodate the 712.1 mm overall diameter. Keep speedometer deviation within ±3% for safety and legal compliance.
| Tire Code | 255/45R19 |
| Section Width | 255 mm |
| Aspect Ratio | 45% |
| Rim Diameter | 19" |
| Sidewall Height | 114.8 mm |
| Overall Diameter | 712.1 mm / 28.04" |
| Circumference | 2237.1 mm / 88.08" |
| Revolutions per km | 447.0 |
| Revolutions per mile | 719.4 |
| Tire Code | OD (mm) | Δ mm | Δ % | Speedo at 100 km/h |
|---|---|---|---|---|
| 255/40R19 | 686.6 | -25.5 | -3.6% | 103.7 |
| 255/45R18 | 686.7 | -25.4 | -3.6% | 103.7 |
| 235/45R19 | 694.1 | -18.0 | -2.5% | 102.6 |
| 245/45R19 | 703.1 | -9.0 | -1.3% | 101.3 |
| 255/45R19 (current) | 712.1 | — | — | 100.0 |
| 255/45R20 | 737.5 | +25.4 | +3.6% | 96.6 |
| 255/50R19 | 737.6 | +25.5 | +3.6% | 96.5 |