235/55R19 vs 255/55R19
255/55R19 is a safe swap for 235/55R19 by the usual ±3% rule: the diameter differs by +2.97%.
Speedometer and odometer
With 255/55R19 on a car calibrated for 235/55R19, the speedometer reads 58.3 mph when you're really doing 60, and the odometer under-counts by 3.0%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.9 mph |
| 45 mph | 46.3 mph |
| 60 mph | 61.8 mph |
| 70 mph | 72.1 mph |
| 80 mph | 82.4 mph |
Other sizes close to 235/55R19
- 235/55R19 vs 235/60R18-0.26%
- 235/55R19 vs 255/45R20-0.49%
- 235/55R19 vs 255/50R19-0.47%
- 235/55R19 vs 255/55R18-0.46%
- 235/55R19 vs 255/45R19-3.91%
- 235/55R19 vs 225/55R19-1.48%
- 235/55R19 vs 235/50R19-3.17%
- 235/55R19 vs 245/55R19+1.48%
- 235/55R19 vs 265/45R20+0.73%
- 235/55R19 vs 265/50R19+0.88%
- 235/55R19 vs 245/50R19-1.82%
- 235/55R19 vs 295/40R20+0.39%
Questions
Can I replace 235/55R19 with 255/55R19?
255/55R19 is a safe swap for 235/55R19 by the usual ±3% rule: the diameter differs by +2.97%.
What's the difference between 235/55R19 and 255/55R19?
255/55R19 is 0.87" taller and 20 mm wider; the sidewall is +0.43". At an indicated 60 mph you'd actually be doing 61.8 mph.
Will 255/55R19 fit on 235/55R19 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.