225/50R16 vs 225/45R17
225/45R17 is a safe swap for 225/50R16 by the usual ±3% rule: the diameter differs by +0.46%.
Speedometer and odometer
With 225/45R17 on a car calibrated for 225/50R16, the speedometer reads 59.7 mph when you're really doing 60, and the odometer under-counts by 0.5%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.2 mph |
| 60 mph | 60.3 mph |
| 70 mph | 70.3 mph |
| 80 mph | 80.4 mph |
Other sizes close to 225/50R16
- 225/50R16 vs 205/55R16+0.08%
- 225/50R16 vs 215/45R17-0.97%
- 225/50R16 vs 205/50R17+0.86%
- 225/50R16 vs 215/55R16+1.82%
- 225/50R16 vs 205/60R16+3.33%
- 225/50R16 vs 195/65R15+0.49%
- 225/50R16 vs 245/40R17-0.57%
- 225/50R16 vs 255/40R17+0.70%
- 225/50R16 vs 195/55R16-1.66%
- 225/50R16 vs 205/50R16-3.17%
- 225/50R16 vs 225/55R16+3.56%
- 225/50R16 vs 195/50R16-4.75%
Questions
Can I replace 225/50R16 with 225/45R17?
225/45R17 is a safe swap for 225/50R16 by the usual ±3% rule: the diameter differs by +0.46%.
What's the difference between 225/50R16 and 225/45R17?
225/45R17 is 0.11" taller and 0 mm wider; the sidewall is -0.44". At an indicated 60 mph you'd actually be doing 60.3 mph.
Will 225/45R17 fit on 225/50R16 wheels?
No — 225/50R16 needs a 16" wheel and 225/45R17 a 17" wheel. This is a plus/minus-size swap that changes wheels too.