215/55R18 vs 235/45R19
235/45R19 is a safe swap for 215/55R18 by the usual ±3% rule: the diameter differs by +0.06%.
Speedometer and odometer
With 235/45R19 on a car calibrated for 215/55R18, the speedometer reads 60.0 mph when you're really doing 60, and the odometer under-counts by 0.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.0 mph |
| 45 mph | 45.0 mph |
| 60 mph | 60.0 mph |
| 70 mph | 70.0 mph |
| 80 mph | 80.0 mph |
Other sizes close to 215/55R18
- 215/55R18 vs 225/45R18-4.90%
- 215/55R18 vs 245/45R18-2.31%
- 215/55R18 vs 235/50R18-0.22%
- 215/55R18 vs 235/55R18+3.17%
- 215/55R18 vs 235/45R18-3.60%
- 215/55R18 vs 235/55R17-0.49%
- 215/55R18 vs 225/60R18+4.83%
- 215/55R18 vs 225/50R18-1.66%
- 215/55R18 vs 225/55R18+1.59%
- 215/55R18 vs 255/40R18-4.69%
- 215/55R18 vs 215/60R17-0.56%
- 215/55R18 vs 245/50R18+1.23%
Questions
Can I replace 215/55R18 with 235/45R19?
235/45R19 is a safe swap for 215/55R18 by the usual ±3% rule: the diameter differs by +0.06%.
What's the difference between 215/55R18 and 235/45R19?
235/45R19 is 0.02" taller and 20 mm wider; the sidewall is -0.49". At an indicated 60 mph you'd actually be doing 60.0 mph.
Will 235/45R19 fit on 215/55R18 wheels?
No — 215/55R18 needs a 18" wheel and 235/45R19 a 19" wheel. This is a plus/minus-size swap that changes wheels too.