285/35R23 vs 325/35R22
325/35R22 is a safe swap for 285/35R23 by the usual ±3% rule: the diameter differs by +0.33%.
Speedometer and odometer
With 325/35R22 on a car calibrated for 285/35R23, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.3%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.1 mph |
| 60 mph | 60.2 mph |
| 70 mph | 70.2 mph |
| 80 mph | 80.3 mph |
Other sizes close to 285/35R23
Questions
Can I replace 285/35R23 with 325/35R22?
325/35R22 is a safe swap for 285/35R23 by the usual ±3% rule: the diameter differs by +0.33%.
What's the difference between 285/35R23 and 325/35R22?
325/35R22 is 0.10" taller and 40 mm wider; the sidewall is +0.55". At an indicated 60 mph you'd actually be doing 60.2 mph.
Will 325/35R22 fit on 285/35R23 wheels?
No — 285/35R23 needs a 23" wheel and 325/35R22 a 22" wheel. This is a plus/minus-size swap that changes wheels too.