255/50R19 vs 255/55R19
255/55R19 is outside the ±3% rule as a replacement for 255/50R19: the diameter differs by +3.46%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 255/55R19 on a car calibrated for 255/50R19, the speedometer reads 58.0 mph when you're really doing 60, and the odometer under-counts by 3.5%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.0 mph |
| 45 mph | 46.6 mph |
| 60 mph | 62.1 mph |
| 70 mph | 72.4 mph |
| 80 mph | 82.8 mph |
Other sizes close to 255/50R19
- 255/50R19 vs 235/60R18+0.22%
- 255/50R19 vs 235/55R19+0.47%
- 255/50R19 vs 245/45R19-4.68%
- 255/50R19 vs 255/45R20-0.01%
- 255/50R19 vs 255/55R18+0.01%
- 255/50R19 vs 255/45R19-3.46%
- 255/50R19 vs 225/55R19-1.02%
- 255/50R19 vs 275/40R19-4.75%
- 255/50R19 vs 235/50R19-2.71%
- 255/50R19 vs 245/55R19+1.97%
- 255/50R19 vs 265/50R19+1.36%
- 255/50R19 vs 245/50R19-1.36%
Questions
Can I replace 255/50R19 with 255/55R19?
255/55R19 is outside the ±3% rule as a replacement for 255/50R19: the diameter differs by +3.46%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 255/50R19 and 255/55R19?
255/55R19 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 255/55R19 fit on 255/50R19 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.