245/50R16 vs 245/45R17
245/45R17 is a safe swap for 245/50R16 by the usual ±3% rule: the diameter differs by +0.14%.
Speedometer and odometer
With 245/45R17 on a car calibrated for 245/50R16, 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 245/50R16
- 245/50R16 vs 225/50R17+0.83%
- 245/50R16 vs 205/55R16-2.99%
- 245/50R16 vs 215/50R17-0.71%
- 245/50R16 vs 215/55R16-1.30%
- 245/50R16 vs 215/60R16+2.00%
- 245/50R16 vs 205/60R16+0.15%
- 245/50R16 vs 205/65R16+3.30%
- 245/50R16 vs 225/60R16+3.84%
- 245/50R16 vs 205/65R15-0.60%
- 245/50R16 vs 195/55R16-4.68%
- 245/50R16 vs 225/50R16-3.07%
- 245/50R16 vs 225/55R16+0.38%
Questions
Can I replace 245/50R16 with 245/45R17?
245/45R17 is a safe swap for 245/50R16 by the usual ±3% rule: the diameter differs by +0.14%.
What's the difference between 245/50R16 and 245/45R17?
245/45R17 is 0.04" taller and 0 mm wider; the sidewall is -0.48". At an indicated 60 mph you'd actually be doing 60.1 mph.
Will 245/45R17 fit on 245/50R16 wheels?
No — 245/50R16 needs a 16" wheel and 245/45R17 a 17" wheel. This is a plus/minus-size swap that changes wheels too.