285/45R19 vs 245/55R19
245/55R19 is a safe swap for 285/45R19 by the usual ±3% rule: the diameter differs by +1.76%.
Speedometer and odometer
With 245/55R19 on a car calibrated for 285/45R19, the speedometer reads 59.0 mph when you're really doing 60, and the odometer under-counts by 1.8%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.5 mph |
| 45 mph | 45.8 mph |
| 60 mph | 61.1 mph |
| 70 mph | 71.2 mph |
| 80 mph | 81.4 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 255/55R19+3.25%
- 285/45R19 vs 265/50R19+1.15%
Questions
Can I replace 285/45R19 with 245/55R19?
245/55R19 is a safe swap for 285/45R19 by the usual ±3% rule: the diameter differs by +1.76%.
What's the difference between 285/45R19 and 245/55R19?
245/55R19 is 0.51" taller and 40 mm narrower; the sidewall is +0.26". At an indicated 60 mph you'd actually be doing 61.1 mph.
Will 245/55R19 fit on 285/45R19 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.