245/50R19 vs 255/55R19
255/55R19 is outside the ±3% rule as a replacement for 245/50R19: the diameter differs by +4.88%, 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 245/50R19, the speedometer reads 57.2 mph when you're really doing 60, and the odometer under-counts by 4.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.5 mph |
| 45 mph | 47.2 mph |
| 60 mph | 62.9 mph |
| 70 mph | 73.4 mph |
| 80 mph | 83.9 mph |
Other sizes close to 245/50R19
- 245/50R19 vs 235/55R19+1.86%
- 245/50R19 vs 245/45R19-3.37%
- 245/50R19 vs 225/60R18-0.05%
- 245/50R19 vs 245/45R20+0.12%
- 245/50R19 vs 255/50R19+1.37%
- 245/50R19 vs 275/40R20+0.05%
- 245/50R19 vs 255/45R19-2.13%
- 245/50R19 vs 225/55R19+0.34%
- 245/50R19 vs 275/40R19-3.44%
- 245/50R19 vs 235/50R19-1.37%
- 245/50R19 vs 245/55R19+3.37%
- 245/50R19 vs 235/45R19-4.60%
Questions
Can I replace 245/50R19 with 255/55R19?
255/55R19 is outside the ±3% rule as a replacement for 245/50R19: the diameter differs by +4.88%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 245/50R19 and 255/55R19?
255/55R19 is 1.40" taller and 10 mm wider; the sidewall is +0.70". At an indicated 60 mph you'd actually be doing 62.9 mph.
Will 255/55R19 fit on 245/50R19 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.