255/35R19 vs 255/40R19
255/40R19 is outside the ±3% rule as a replacement for 255/35R19: the diameter differs by +3.86%, 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 255/35R19, the speedometer reads 57.8 mph when you're really doing 60, and the odometer under-counts by 3.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.2 mph |
| 45 mph | 46.7 mph |
| 60 mph | 62.3 mph |
| 70 mph | 72.7 mph |
| 80 mph | 83.1 mph |
Other sizes close to 255/35R19
- 255/35R19 vs 225/45R18-0.21%
- 255/35R19 vs 245/40R19+2.65%
- 255/35R19 vs 235/40R19+1.44%
- 255/35R19 vs 255/40R18+0.02%
- 255/35R19 vs 275/35R19+2.12%
- 255/35R19 vs 245/35R19-1.06%
- 255/35R19 vs 225/40R19+0.23%
- 255/35R19 vs 235/35R19-2.12%
- 255/35R19 vs 225/45R19+3.63%
- 255/35R19 vs 285/35R19+3.18%
- 255/35R19 vs 265/35R19+1.06%
- 255/35R19 vs 235/45R19+4.99%
Questions
Can I replace 255/35R19 with 255/40R19?
255/40R19 is outside the ±3% rule as a replacement for 255/35R19: the diameter differs by +3.86%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 255/35R19 and 255/40R19?
255/40R19 is 1.00" taller and 0 mm wider; the sidewall is +0.50". At an indicated 60 mph you'd actually be doing 62.3 mph.
Will 255/40R19 fit on 255/35R19 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.