245/45R17 vs 225/55R16
225/55R16 is a safe swap for 245/45R17 by the usual ±3% rule: the diameter differs by +0.25%.
Speedometer and odometer
With 225/55R16 on a car calibrated for 245/45R17, the speedometer reads 59.9 mph when you're really doing 60, and the odometer under-counts by 0.2%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.1 mph |
| 60 mph | 60.1 mph |
| 70 mph | 70.2 mph |
| 80 mph | 80.2 mph |
Other sizes close to 245/45R17
- 245/45R17 vs 225/45R17-2.76%
- 245/45R17 vs 245/40R18+0.14%
- 245/45R17 vs 225/50R17+0.69%
- 245/45R17 vs 225/55R17+4.14%
- 245/45R17 vs 215/45R17-4.14%
- 245/45R17 vs 205/50R17-2.38%
- 245/45R17 vs 215/55R17+2.45%
- 245/45R17 vs 215/50R17-0.84%
- 245/45R17 vs 235/45R17-1.38%
- 245/45R17 vs 205/60R16+0.02%
- 245/45R17 vs 245/40R17-3.76%
- 245/45R17 vs 275/35R18-0.40%
Questions
Can I replace 245/45R17 with 225/55R16?
225/55R16 is a safe swap for 245/45R17 by the usual ±3% rule: the diameter differs by +0.25%.
What's the difference between 245/45R17 and 225/55R16?
225/55R16 is 0.06" taller and 20 mm narrower; the sidewall is +0.53". At an indicated 60 mph you'd actually be doing 60.1 mph.
Will 225/55R16 fit on 245/45R17 wheels?
No — 245/45R17 needs a 17" wheel and 225/55R16 a 16" wheel. This is a plus/minus-size swap that changes wheels too.