235/35R19 vs 245/40R19
245/40R19 is outside the ±3% rule as a replacement for 235/35R19: the diameter differs by +4.87%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 245/40R19 on a car calibrated for 235/35R19, the speedometer reads 57.2 mph when you're really doing 60, and the odometer under-counts by 4.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.5 mph |
| 45 mph | 47.2 mph |
| 60 mph | 62.9 mph |
| 70 mph | 73.4 mph |
| 80 mph | 83.9 mph |
Other sizes close to 235/35R19
- 235/35R19 vs 245/40R18+0.94%
- 235/35R19 vs 235/40R18-0.29%
- 235/35R19 vs 235/40R19+3.63%
- 235/35R19 vs 255/35R19+2.16%
- 235/35R19 vs 275/35R19+4.33%
- 235/35R19 vs 245/35R19+1.08%
- 235/35R19 vs 225/40R19+2.40%
- 235/35R19 vs 275/35R18+0.40%
- 235/35R19 vs 265/35R18-0.68%
- 235/35R19 vs 265/35R19+3.25%
- 235/35R19 vs 215/45R18+0.56%
- 235/35R19 vs 285/30R19+1.00%
Questions
Can I replace 235/35R19 with 245/40R19?
245/40R19 is outside the ±3% rule as a replacement for 235/35R19: the diameter differs by +4.87%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 235/35R19 and 245/40R19?
245/40R19 is 1.24" taller and 10 mm wider; the sidewall is +0.62". At an indicated 60 mph you'd actually be doing 62.9 mph.
Will 245/40R19 fit on 235/35R19 wheels?
Both use a 19" rim, so the wheel diameter matches; check the wheel's width range for a 245 mm tire and the fender clearance.