325/35R22 vs 305/40R22
305/40R22 is a safe swap for 325/35R22 by the usual ±3% rule: the diameter differs by +2.10%.
Speedometer and odometer
With 305/40R22 on a car calibrated for 325/35R22, the speedometer reads 58.8 mph when you're really doing 60, and the odometer under-counts by 2.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.6 mph |
| 45 mph | 45.9 mph |
| 60 mph | 61.3 mph |
| 70 mph | 71.5 mph |
| 80 mph | 81.7 mph |
Other sizes close to 325/35R22
- 325/35R22 vs 285/45R22+3.69%
- 325/35R22 vs 275/40R22-0.95%
- 325/35R22 vs 275/45R21-0.69%
- 325/35R22 vs 265/40R22-1.97%
- 325/35R22 vs 285/35R22-3.56%
- 325/35R22 vs 285/40R22+0.06%
- 325/35R22 vs 285/45R21+0.46%
- 325/35R22 vs 275/45R22+2.54%
- 325/35R22 vs 275/35R22-4.45%
- 325/35R22 vs 315/40R21-0.11%
- 325/35R22 vs 315/35R22-0.89%
- 325/35R22 vs 295/35R22-2.67%
Questions
Can I replace 325/35R22 with 305/40R22?
305/40R22 is a safe swap for 325/35R22 by the usual ±3% rule: the diameter differs by +2.10%.
What's the difference between 325/35R22 and 305/40R22?
305/40R22 is 0.65" taller and 20 mm narrower; the sidewall is +0.32". At an indicated 60 mph you'd actually be doing 61.3 mph.
Will 305/40R22 fit on 325/35R22 wheels?
Both use a 22" rim, so the wheel diameter matches; check the wheel's width range for a 305 mm tire and the fender clearance.