215/50R18 vs 245/40R19
245/40R19 is a safe swap for 215/50R18 by the usual ±3% rule: the diameter differs by +0.95%.
Speedometer and odometer
With 245/40R19 on a car calibrated for 215/50R18, the speedometer reads 59.4 mph when you're really doing 60, and the odometer under-counts by 1.0%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.3 mph |
| 45 mph | 45.4 mph |
| 60 mph | 60.6 mph |
| 70 mph | 70.7 mph |
| 80 mph | 80.8 mph |
Other sizes close to 215/50R18
- 215/50R18 vs 225/45R18-1.86%
- 215/50R18 vs 245/40R18-2.83%
- 215/50R18 vs 245/45R18+0.82%
- 215/50R18 vs 235/50R18+2.98%
- 215/50R18 vs 235/45R18-0.52%
- 215/50R18 vs 215/55R17-0.58%
- 215/50R18 vs 235/40R18-4.02%
- 215/50R18 vs 225/50R18+1.49%
- 215/50R18 vs 235/40R19-0.24%
- 215/50R18 vs 225/55R18+4.83%
- 215/50R18 vs 255/40R18-1.64%
- 215/50R18 vs 275/35R19+0.43%
Questions
Can I replace 215/50R18 with 245/40R19?
245/40R19 is a safe swap for 215/50R18 by the usual ±3% rule: the diameter differs by +0.95%.
What's the difference between 215/50R18 and 245/40R19?
245/40R19 is 0.25" taller and 30 mm wider; the sidewall is -0.37". At an indicated 60 mph you'd actually be doing 60.6 mph.
Will 245/40R19 fit on 215/50R18 wheels?
No — 215/50R18 needs a 18" wheel and 245/40R19 a 19" wheel. This is a plus/minus-size swap that changes wheels too.