245/45R16 vs 225/55R16
225/55R16 is outside the ±3% rule as a replacement for 245/45R16: the diameter differs by +4.31%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 225/55R16 on a car calibrated for 245/45R16, the speedometer reads 57.5 mph when you're really doing 60, and the odometer under-counts by 4.3%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.3 mph |
| 45 mph | 46.9 mph |
| 60 mph | 62.6 mph |
| 70 mph | 73.0 mph |
| 80 mph | 83.4 mph |
Other sizes close to 245/45R16
- 245/45R16 vs 205/55R16+0.80%
- 245/45R16 vs 215/45R17-0.26%
- 245/45R16 vs 215/55R16+2.55%
- 245/45R16 vs 205/60R16+4.07%
- 245/45R16 vs 245/40R17+0.14%
- 245/45R16 vs 185/65R15-0.86%
- 245/45R16 vs 195/55R16-0.96%
- 245/45R16 vs 225/50R16+0.72%
- 245/45R16 vs 205/50R16-2.47%
- 245/45R16 vs 195/50R16-4.07%
- 245/45R16 vs 205/60R15+0.02%
- 245/45R16 vs 185/55R16-2.71%
Questions
Can I replace 245/45R16 with 225/55R16?
225/55R16 is outside the ±3% rule as a replacement for 245/45R16: the diameter differs by +4.31%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 245/45R16 and 225/55R16?
225/55R16 is 1.06" taller and 20 mm narrower; the sidewall is +0.53". At an indicated 60 mph you'd actually be doing 62.6 mph.
Will 225/55R16 fit on 245/45R16 wheels?
Both use a 16" rim, so the wheel diameter matches; check the wheel's width range for a 225 mm tire and the fender clearance.