255/45R19 vs 235/50R19
235/50R19 is a safe swap for 255/45R19 by the usual ±3% rule: the diameter differs by +0.77%.
Speedometer and odometer
With 235/50R19 on a car calibrated for 255/45R19, the speedometer reads 59.5 mph when you're really doing 60, and the odometer under-counts by 0.8%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.2 mph |
| 45 mph | 45.3 mph |
| 60 mph | 60.5 mph |
| 70 mph | 70.5 mph |
| 80 mph | 80.6 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 285/35R19-4.21%
- 255/45R19 vs 235/45R19-2.53%
Questions
Can I replace 255/45R19 with 235/50R19?
235/50R19 is a safe swap for 255/45R19 by the usual ±3% rule: the diameter differs by +0.77%.
What's the difference between 255/45R19 and 235/50R19?
235/50R19 is 0.22" taller and 20 mm narrower; the sidewall is +0.11". At an indicated 60 mph you'd actually be doing 60.5 mph.
Will 235/50R19 fit on 255/45R19 wheels?
Both use a 19" rim, so the wheel diameter matches; check the wheel's width range for a 235 mm tire and the fender clearance.