285/35R19 vs 255/45R19
255/45R19 is outside the ±3% rule as a replacement for 285/35R19: the diameter differs by +4.40%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 255/45R19 on a car calibrated for 285/35R19, the speedometer reads 57.5 mph when you're really doing 60, and the odometer under-counts by 4.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.3 mph |
| 45 mph | 47.0 mph |
| 60 mph | 62.6 mph |
| 70 mph | 73.1 mph |
| 80 mph | 83.5 mph |
Other sizes close to 285/35R19
- 285/35R19 vs 245/45R18-0.65%
- 285/35R19 vs 245/45R19+3.08%
- 285/35R19 vs 245/40R19-0.51%
- 285/35R19 vs 225/50R18+0.01%
- 285/35R19 vs 235/40R19-1.69%
- 285/35R19 vs 255/40R19+0.66%
- 285/35R19 vs 255/35R19-3.08%
- 285/35R19 vs 275/35R19-1.03%
- 285/35R19 vs 275/40R19+3.01%
- 285/35R19 vs 245/35R20-0.38%
- 285/35R19 vs 245/35R19-4.10%
- 285/35R19 vs 255/35R20+0.65%
Questions
Can I replace 285/35R19 with 255/45R19?
255/45R19 is outside the ±3% rule as a replacement for 285/35R19: the diameter differs by +4.40%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 285/35R19 and 255/45R19?
255/45R19 is 1.18" taller and 30 mm narrower; the sidewall is +0.59". At an indicated 60 mph you'd actually be doing 62.6 mph.
Will 255/45R19 fit on 285/35R19 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.