285/50R22 vs 325/50R22
325/50R22 is outside the ±3% rule as a replacement for 285/50R22: the diameter differs by +4.74%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 325/50R22 on a car calibrated for 285/50R22, the speedometer reads 57.3 mph when you're really doing 60, and the odometer under-counts by 4.7%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.4 mph |
| 45 mph | 47.1 mph |
| 60 mph | 62.8 mph |
| 70 mph | 73.3 mph |
| 80 mph | 83.8 mph |
Other sizes close to 285/50R22
Questions
Can I replace 285/50R22 with 325/50R22?
325/50R22 is outside the ±3% rule as a replacement for 285/50R22: the diameter differs by +4.74%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 285/50R22 and 325/50R22?
325/50R22 is 1.57" taller and 40 mm wider; the sidewall is +0.79". At an indicated 60 mph you'd actually be doing 62.8 mph.
Will 325/50R22 fit on 285/50R22 wheels?
Both use a 22" rim, so the wheel diameter matches; check the wheel's width range for a 325 mm tire and the fender clearance.