275/35R19 vs 245/45R19
245/45R19 is outside the ±3% rule as a replacement for 275/35R19: the diameter differs by +4.15%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 245/45R19 on a car calibrated for 275/35R19, 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 | 46.9 mph |
| 60 mph | 62.5 mph |
| 70 mph | 72.9 mph |
| 80 mph | 83.3 mph |
Other sizes close to 275/35R19
- 275/35R19 vs 245/45R18+0.39%
- 275/35R19 vs 235/45R18-0.95%
- 275/35R19 vs 245/40R19+0.52%
- 275/35R19 vs 235/40R19-0.67%
- 275/35R19 vs 255/40R19+1.70%
- 275/35R19 vs 255/35R19-2.07%
- 275/35R19 vs 275/40R19+4.07%
- 275/35R19 vs 245/35R20+0.65%
- 275/35R19 vs 245/35R19-3.11%
- 275/35R19 vs 225/40R19-1.85%
- 275/35R19 vs 235/35R19-4.15%
- 275/35R19 vs 225/45R19+1.48%
Questions
Can I replace 275/35R19 with 245/45R19?
245/45R19 is outside the ±3% rule as a replacement for 275/35R19: the diameter differs by +4.15%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 275/35R19 and 245/45R19?
245/45R19 is 1.10" taller and 30 mm narrower; the sidewall is +0.55". At an indicated 60 mph you'd actually be doing 62.5 mph.
Will 245/45R19 fit on 275/35R19 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.