285/45R19 vs 265/45R20
265/45R20 is a safe swap for 285/45R19 by the usual ±3% rule: the diameter differs by +1.00%.
Speedometer and odometer
With 265/45R20 on a car calibrated for 285/45R19, the speedometer reads 59.4 mph when you're really doing 60, and the odometer under-counts by 1.0%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.3 mph |
| 45 mph | 45.5 mph |
| 60 mph | 60.6 mph |
| 70 mph | 70.7 mph |
| 80 mph | 80.8 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 255/55R19+3.25%
Questions
Can I replace 285/45R19 with 265/45R20?
265/45R20 is a safe swap for 285/45R19 by the usual ±3% rule: the diameter differs by +1.00%.
What's the difference between 285/45R19 and 265/45R20?
265/45R20 is 0.29" taller and 20 mm narrower; the sidewall is -0.35". At an indicated 60 mph you'd actually be doing 60.6 mph.
Will 265/45R20 fit on 285/45R19 wheels?
No — 285/45R19 needs a 19" wheel and 265/45R20 a 20" wheel. This is a plus/minus-size swap that changes wheels too.