295/30R19 vs 255/40R19
255/40R19 is outside the ±3% rule as a replacement for 295/30R19: the diameter differs by +4.09%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 255/40R19 on a car calibrated for 295/30R19, the speedometer reads 57.6 mph when you're really doing 60, and the odometer under-counts by 4.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.2 mph |
| 45 mph | 46.8 mph |
| 60 mph | 62.5 mph |
| 70 mph | 72.9 mph |
| 80 mph | 83.3 mph |
Other sizes close to 295/30R19
- 295/30R19 vs 225/45R18+0.02%
- 295/30R19 vs 245/40R18-0.97%
- 295/30R19 vs 245/40R19+2.88%
- 295/30R19 vs 235/40R19+1.67%
- 295/30R19 vs 255/35R19+0.23%
- 295/30R19 vs 255/40R18+0.24%
- 295/30R19 vs 275/35R19+2.35%
- 295/30R19 vs 245/35R19-0.83%
- 295/30R19 vs 225/40R19+0.45%
- 295/30R19 vs 235/35R19-1.90%
- 295/30R19 vs 225/45R19+3.87%
- 295/30R19 vs 285/35R19+3.41%
Questions
Can I replace 295/30R19 with 255/40R19?
255/40R19 is outside the ±3% rule as a replacement for 295/30R19: the diameter differs by +4.09%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 295/30R19 and 255/40R19?
255/40R19 is 1.06" taller and 40 mm narrower; the sidewall is +0.53". At an indicated 60 mph you'd actually be doing 62.5 mph.
Will 255/40R19 fit on 295/30R19 wheels?
Both use a 19" rim, so the wheel diameter matches; check the wheel's width range for a 255 mm tire and the fender clearance.