285/40R22 vs 285/45R22
285/45R22 is outside the ±3% rule as a replacement for 285/40R22: the diameter differs by +3.62%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 285/45R22 on a car calibrated for 285/40R22, the speedometer reads 57.9 mph when you're really doing 60, and the odometer under-counts by 3.6%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.1 mph |
| 45 mph | 46.6 mph |
| 60 mph | 62.2 mph |
| 70 mph | 72.5 mph |
| 80 mph | 82.9 mph |
Other sizes close to 285/40R22
- 285/40R22 vs 275/40R22-1.02%
- 285/40R22 vs 275/45R21-0.75%
- 285/40R22 vs 265/40R22-2.03%
- 285/40R22 vs 285/35R22-3.62%
- 285/40R22 vs 285/45R21+0.39%
- 285/40R22 vs 275/45R22+2.48%
- 285/40R22 vs 305/40R22+2.03%
- 285/40R22 vs 275/35R22-4.51%
- 285/40R22 vs 315/40R21-0.18%
- 285/40R22 vs 325/35R22-0.06%
- 285/40R22 vs 315/35R22-0.95%
- 285/40R22 vs 295/35R22-2.73%
Questions
Can I replace 285/40R22 with 285/45R22?
285/45R22 is outside the ±3% rule as a replacement for 285/40R22: the diameter differs by +3.62%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 285/40R22 and 285/45R22?
285/45R22 is 1.12" taller and 0 mm wider; the sidewall is +0.56". At an indicated 60 mph you'd actually be doing 62.2 mph.
Will 285/45R22 fit on 285/40R22 wheels?
Both use a 22" rim, so the wheel diameter matches; check the wheel's width range for a 285 mm tire and the fender clearance.