255/45R19 vs 255/50R19
255/50R19 is outside the ±3% rule as a replacement for 255/45R19: the diameter differs by +3.58%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 255/50R19 on a car calibrated for 255/45R19, the speedometer reads 57.9 mph when you're really doing 60, and the odometer under-counts by 3.6%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.1 mph |
| 45 mph | 46.6 mph |
| 60 mph | 62.1 mph |
| 70 mph | 72.5 mph |
| 80 mph | 82.9 mph |
Other sizes close to 255/45R19
- 255/45R19 vs 235/55R19+4.07%
- 255/45R19 vs 235/55R18+0.51%
- 255/45R19 vs 245/45R19-1.26%
- 255/45R19 vs 245/40R19-4.70%
- 255/45R19 vs 255/40R19-3.58%
- 255/45R19 vs 225/55R19+2.53%
- 255/45R19 vs 275/40R19-1.33%
- 255/45R19 vs 255/40R20-0.01%
- 255/45R19 vs 225/45R19-3.79%
- 255/45R19 vs 235/50R19+0.77%
- 255/45R19 vs 285/35R19-4.21%
- 255/45R19 vs 235/45R19-2.53%
Questions
Can I replace 255/45R19 with 255/50R19?
255/50R19 is outside the ±3% rule as a replacement for 255/45R19: the diameter differs by +3.58%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 255/45R19 and 255/50R19?
255/50R19 is 1.00" taller and 0 mm wider; the sidewall is +0.50". At an indicated 60 mph you'd actually be doing 62.1 mph.
Will 255/50R19 fit on 255/45R19 wheels?
Both use a 19" rim, so the wheel diameter matches; check the wheel's width range for a 255 mm tire and the fender clearance.