295/30R22 vs 255/40R22
255/40R22 is outside the ±3% rule as a replacement for 295/30R22: the diameter differs by +3.67%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 255/40R22 on a car calibrated for 295/30R22, the speedometer reads 57.9 mph when you're really doing 60, and the odometer under-counts by 3.7%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.1 mph |
| 45 mph | 46.7 mph |
| 60 mph | 62.2 mph |
| 70 mph | 72.6 mph |
| 80 mph | 82.9 mph |
Other sizes close to 295/30R22
- 295/30R22 vs 295/35R21+0.56%
- 295/30R22 vs 265/40R22+4.76%
- 295/30R22 vs 255/40R21+0.22%
- 295/30R22 vs 265/35R22+1.16%
- 295/30R22 vs 285/35R22+3.06%
- 295/30R22 vs 285/35R21-0.39%
- 295/30R22 vs 245/40R21-0.87%
- 295/30R22 vs 275/35R22+2.11%
- 295/30R22 vs 295/35R22+4.01%
- 295/30R22 vs 285/30R22-0.82%
- 295/30R22 vs 315/30R22+1.63%
- 295/30R22 vs 265/30R22-2.45%
Questions
Can I replace 295/30R22 with 255/40R22?
255/40R22 is outside the ±3% rule as a replacement for 295/30R22: the diameter differs by +3.67%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 295/30R22 and 255/40R22?
255/40R22 is 1.06" taller and 40 mm narrower; the sidewall is +0.53". At an indicated 60 mph you'd actually be doing 62.2 mph.
Will 255/40R22 fit on 295/30R22 wheels?
Both use a 22" rim, so the wheel diameter matches; check the wheel's width range for a 255 mm tire and the fender clearance.