255/30R22 vs 295/30R22
295/30R22 is outside the ±3% rule as a replacement for 255/30R22: the diameter differs by +3.37%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 295/30R22 on a car calibrated for 255/30R22, the speedometer reads 58.0 mph when you're really doing 60, and the odometer under-counts by 3.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.0 mph |
| 45 mph | 46.5 mph |
| 60 mph | 62.0 mph |
| 70 mph | 72.4 mph |
| 80 mph | 82.7 mph |
Other sizes close to 255/30R22
Questions
Can I replace 255/30R22 with 295/30R22?
295/30R22 is outside the ±3% rule as a replacement for 255/30R22: the diameter differs by +3.37%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 255/30R22 and 295/30R22?
295/30R22 is 0.94" taller and 40 mm wider; the sidewall is +0.47". At an indicated 60 mph you'd actually be doing 62.0 mph.
Will 295/30R22 fit on 255/30R22 wheels?
Both use a 22" rim, so the wheel diameter matches; check the wheel's width range for a 295 mm tire and the fender clearance.