285/45R19 vs 255/55R19
255/55R19 is outside the ±3% rule as a replacement for 285/45R19: the diameter differs by +3.25%, 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 285/45R19, the speedometer reads 58.1 mph when you're really doing 60, and the odometer under-counts by 3.2%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.0 mph |
| 45 mph | 46.5 mph |
| 60 mph | 61.9 mph |
| 70 mph | 72.3 mph |
| 80 mph | 82.6 mph |
Other sizes close to 285/45R19
- 285/45R19 vs 235/60R18+0.01%
- 285/45R19 vs 235/55R19+0.27%
- 285/45R19 vs 245/45R19-4.87%
- 285/45R19 vs 255/45R20-0.22%
- 285/45R19 vs 255/50R19-0.20%
- 285/45R19 vs 255/55R18-0.19%
- 285/45R19 vs 255/45R19-3.65%
- 285/45R19 vs 225/55R19-1.22%
- 285/45R19 vs 275/40R19-4.94%
- 285/45R19 vs 235/50R19-2.91%
- 285/45R19 vs 245/55R19+1.76%
- 285/45R19 vs 265/50R19+1.15%
Questions
Can I replace 285/45R19 with 255/55R19?
255/55R19 is outside the ±3% rule as a replacement for 285/45R19: the diameter differs by +3.25%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 285/45R19 and 255/55R19?
255/55R19 is 0.94" taller and 30 mm narrower; the sidewall is +0.47". At an indicated 60 mph you'd actually be doing 61.9 mph.
Will 255/55R19 fit on 285/45R19 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.