285/40R19 vs 245/50R19
245/50R19 is a safe swap for 285/40R19 by the usual ±3% rule: the diameter differs by +2.39%.
Speedometer and odometer
With 245/50R19 on a car calibrated for 285/40R19, the speedometer reads 58.6 mph when you're really doing 60, and the odometer under-counts by 2.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.7 mph |
| 45 mph | 46.1 mph |
| 60 mph | 61.4 mph |
| 70 mph | 71.7 mph |
| 80 mph | 81.9 mph |
Other sizes close to 285/40R19
- 285/40R19 vs 235/55R19+4.29%
- 285/40R19 vs 235/55R18+0.72%
- 285/40R19 vs 245/45R19-1.06%
- 285/40R19 vs 245/40R19-4.50%
- 285/40R19 vs 255/50R19+3.80%
- 285/40R19 vs 255/40R19-3.38%
- 285/40R19 vs 225/55R18-0.83%
- 285/40R19 vs 245/40R20-0.93%
- 285/40R19 vs 255/45R19+0.21%
- 285/40R19 vs 275/35R19-5.00%
- 285/40R19 vs 225/55R19+2.74%
- 285/40R19 vs 275/40R19-1.13%
Questions
Can I replace 285/40R19 with 245/50R19?
245/50R19 is a safe swap for 285/40R19 by the usual ±3% rule: the diameter differs by +2.39%.
What's the difference between 285/40R19 and 245/50R19?
245/50R19 is 0.67" taller and 40 mm narrower; the sidewall is +0.33". At an indicated 60 mph you'd actually be doing 61.4 mph.
Will 245/50R19 fit on 285/40R19 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.