275/35R19 vs 255/40R19
255/40R19 is a safe swap for 275/35R19 by the usual ±3% rule: the diameter differs by +1.70%.
Speedometer and odometer
With 255/40R19 on a car calibrated for 275/35R19, the speedometer reads 59.0 mph when you're really doing 60, and the odometer under-counts by 1.7%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.5 mph |
| 45 mph | 45.8 mph |
| 60 mph | 61.0 mph |
| 70 mph | 71.2 mph |
| 80 mph | 81.4 mph |
Other sizes close to 275/35R19
- 275/35R19 vs 245/45R18+0.39%
- 275/35R19 vs 235/45R18-0.95%
- 275/35R19 vs 245/45R19+4.15%
- 275/35R19 vs 245/40R19+0.52%
- 275/35R19 vs 235/40R19-0.67%
- 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 255/40R19?
255/40R19 is a safe swap for 275/35R19 by the usual ±3% rule: the diameter differs by +1.70%.
What's the difference between 275/35R19 and 255/40R19?
255/40R19 is 0.45" taller and 20 mm narrower; the sidewall is +0.23". At an indicated 60 mph you'd actually be doing 61.0 mph.
Will 255/40R19 fit on 275/35R19 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.