295/40R18 vs 235/45R19
235/45R19 is a safe swap for 295/40R18 by the usual ±3% rule: the diameter differs by +0.13%.
Speedometer and odometer
With 235/45R19 on a car calibrated for 295/40R18, the speedometer reads 59.9 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 | 45.1 mph |
| 60 mph | 60.1 mph |
| 70 mph | 70.1 mph |
| 80 mph | 80.1 mph |
Other sizes close to 295/40R18
- 295/40R18 vs 225/45R18-4.83%
- 295/40R18 vs 245/45R18-2.24%
- 295/40R18 vs 235/50R18-0.14%
- 295/40R18 vs 235/55R18+3.25%
- 295/40R18 vs 235/45R18-3.53%
- 295/40R18 vs 235/55R17-0.42%
- 295/40R18 vs 225/60R18+4.90%
- 295/40R18 vs 225/50R18-1.59%
- 295/40R18 vs 255/40R19-0.95%
- 295/40R18 vs 225/55R18+1.66%
- 295/40R18 vs 255/40R18-4.62%
- 295/40R18 vs 215/60R17-0.49%
Questions
Can I replace 295/40R18 with 235/45R19?
235/45R19 is a safe swap for 295/40R18 by the usual ±3% rule: the diameter differs by +0.13%.
What's the difference between 295/40R18 and 235/45R19?
235/45R19 is 0.04" taller and 60 mm narrower; the sidewall is -0.48". At an indicated 60 mph you'd actually be doing 60.1 mph.
Will 235/45R19 fit on 295/40R18 wheels?
No — 295/40R18 needs a 18" wheel and 235/45R19 a 19" wheel. This is a plus/minus-size swap that changes wheels too.