245/45R16 vs 205/55R16
205/55R16 is a safe swap for 245/45R16 by the usual ±3% rule: the diameter differs by +0.80%.
Speedometer and odometer
With 205/55R16 on a car calibrated for 245/45R16, the speedometer reads 59.5 mph when you're really doing 60, and the odometer under-counts by 0.8%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.2 mph |
| 45 mph | 45.4 mph |
| 60 mph | 60.5 mph |
| 70 mph | 70.6 mph |
| 80 mph | 80.6 mph |
Other sizes close to 245/45R16
- 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 225/55R16+4.31%
- 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 205/55R16?
205/55R16 is a safe swap for 245/45R16 by the usual ±3% rule: the diameter differs by +0.80%.
What's the difference between 245/45R16 and 205/55R16?
205/55R16 is 0.20" taller and 40 mm narrower; the sidewall is +0.10". At an indicated 60 mph you'd actually be doing 60.5 mph.
Will 205/55R16 fit on 245/45R16 wheels?
Both use a 16" rim, so the wheel diameter matches; check the wheel's width range for a 205 mm tire and the fender clearance.