The 255/40R19 is a common tire size for performance and sports cars such as BMW 3 Series, Volkswagen GTI, and Audi A4.
With a 102.0 mm sidewall (40% aspect ratio), this low-profile tire delivers sharp steering response and precise cornering grip, though the ride feels firmer over rough surfaces.
Compared to the baseline 245/40R19, this tire's overall diameter differs by +1.2% — a speedometer calibrated for 245/40R19 would read 98.8 km/h at an actual 100 km/h.
When replacing, verify that your wheel well can accommodate the 686.6 mm overall diameter. Keep speedometer deviation within ±3% for safety and legal compliance.
| Tire Code | 255/40R19 |
| Section Width | 255 mm |
| Aspect Ratio | 40% |
| Rim Diameter | 19" |
| Sidewall Height | 102.0 mm |
| Overall Diameter | 686.6 mm / 27.03" |
| Circumference | 2157.0 mm / 84.92" |
| Revolutions per km | 463.6 |
| Revolutions per mile | 746.1 |
| Tire Code | OD (mm) | Δ mm | Δ % | Speedo at 100 km/h |
|---|---|---|---|---|
| 255/35R19 | 661.1 | -25.5 | -3.7% | 103.9 |
| 255/40R18 | 661.2 | -25.4 | -3.7% | 103.8 |
| 235/40R19 | 670.6 | -16.0 | -2.3% | 102.4 |
| 245/40R19 | 678.6 | -8.0 | -1.2% | 101.2 |
| 255/40R19 (current) | 686.6 | — | — | 100.0 |
| 255/45R19 | 712.1 | +25.5 | +3.7% | 96.4 |