205/70R16 vs 225/70R15
225/70R15 is a safe swap for 205/70R16 by the usual ±3% rule: the diameter differs by +0.37%.
Speedometer and odometer
With 225/70R15 on a car calibrated for 205/70R16, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.2 mph |
| 60 mph | 60.2 mph |
| 70 mph | 70.3 mph |
| 80 mph | 80.3 mph |
Other sizes close to 205/70R16
- 205/70R16 vs 235/55R17-0.45%
- 205/70R16 vs 215/65R16-1.08%
- 205/70R16 vs 215/60R16-4.18%
- 205/70R16 vs 215/70R16+2.02%
- 205/70R16 vs 215/60R17-0.52%
- 205/70R16 vs 205/65R16-2.96%
- 205/70R16 vs 235/65R16+2.67%
- 205/70R16 vs 225/60R16-2.45%
- 205/70R16 vs 225/70R16+4.04%
- 205/70R16 vs 225/65R16+0.79%
- 205/70R16 vs 235/60R16-0.72%
- 205/70R16 vs 195/75R16+0.79%
Questions
Can I replace 205/70R16 with 225/70R15?
225/70R15 is a safe swap for 205/70R16 by the usual ±3% rule: the diameter differs by +0.37%.
What's the difference between 205/70R16 and 225/70R15?
225/70R15 is 0.10" taller and 20 mm wider; the sidewall is +0.55". At an indicated 60 mph you'd actually be doing 60.2 mph.
Will 225/70R15 fit on 205/70R16 wheels?
No — 205/70R16 needs a 16" wheel and 225/70R15 a 15" wheel. This is a plus/minus-size swap that changes wheels too.