275/45R19 vs 255/55R19
255/55R19 is outside the ±3% rule as a replacement for 275/45R19: the diameter differs by +4.52%, 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 275/45R19, the speedometer reads 57.4 mph when you're really doing 60, and the odometer under-counts by 4.5%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.4 mph |
| 45 mph | 47.0 mph |
| 60 mph | 62.7 mph |
| 70 mph | 73.2 mph |
| 80 mph | 83.6 mph |
Other sizes close to 275/45R19
- 275/45R19 vs 235/55R19+1.51%
- 275/45R19 vs 245/45R19-3.70%
- 275/45R19 vs 225/60R18-0.40%
- 275/45R19 vs 245/45R20-0.22%
- 275/45R19 vs 255/50R19+1.03%
- 275/45R19 vs 275/40R20-0.29%
- 275/45R19 vs 255/45R19-2.47%
- 275/45R19 vs 225/55R190.00%
- 275/45R19 vs 275/40R19-3.77%
- 275/45R19 vs 235/50R19-1.71%
- 275/45R19 vs 245/55R19+3.01%
- 275/45R19 vs 235/45R19-4.93%
Questions
Can I replace 275/45R19 with 255/55R19?
255/55R19 is outside the ±3% rule as a replacement for 275/45R19: the diameter differs by +4.52%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 275/45R19 and 255/55R19?
255/55R19 is 1.30" taller and 20 mm narrower; the sidewall is +0.65". At an indicated 60 mph you'd actually be doing 62.7 mph.
Will 255/55R19 fit on 275/45R19 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.