255/45R19 vs 245/50R19
245/50R19 is a safe swap for 255/45R19 by the usual ±3% rule: the diameter differs by +2.18%.
Speedometer and odometer
With 245/50R19 on a car calibrated for 255/45R19, the speedometer reads 58.7 mph when you're really doing 60, and the odometer under-counts by 2.2%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.7 mph |
| 45 mph | 46.0 mph |
| 60 mph | 61.3 mph |
| 70 mph | 71.5 mph |
| 80 mph | 81.7 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 255/50R19+3.58%
- 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%
Questions
Can I replace 255/45R19 with 245/50R19?
245/50R19 is a safe swap for 255/45R19 by the usual ±3% rule: the diameter differs by +2.18%.
What's the difference between 255/45R19 and 245/50R19?
245/50R19 is 0.61" taller and 10 mm narrower; the sidewall is +0.31". At an indicated 60 mph you'd actually be doing 61.3 mph.
Will 245/50R19 fit on 255/45R19 wheels?
Both use a 19" rim, so the wheel diameter matches; check the wheel's width range for a 245 mm tire and the fender clearance.