285/55R22 vs 325/50R22
325/50R22 is a safe swap for 285/55R22 by the usual ±3% rule: the diameter differs by +1.32%.
Speedometer and odometer
With 325/50R22 on a car calibrated for 285/55R22, the speedometer reads 59.2 mph when you're really doing 60, and the odometer under-counts by 1.3%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.4 mph |
| 45 mph | 45.6 mph |
| 60 mph | 60.8 mph |
| 70 mph | 70.9 mph |
| 80 mph | 81.1 mph |
Other sizes close to 285/55R22
Questions
Can I replace 285/55R22 with 325/50R22?
325/50R22 is a safe swap for 285/55R22 by the usual ±3% rule: the diameter differs by +1.32%.
What's the difference between 285/55R22 and 325/50R22?
325/50R22 is 0.45" taller and 40 mm wider; the sidewall is +0.23". At an indicated 60 mph you'd actually be doing 60.8 mph.
Will 325/50R22 fit on 285/55R22 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.