235/65R16 vs 225/75R15
225/75R15 is a safe swap for 235/65R16 by the usual ±3% rule: the diameter differs by +0.93%.
Speedometer and odometer
With 225/75R15 on a car calibrated for 235/65R16, the speedometer reads 59.4 mph when you're really doing 60, and the odometer under-counts by 0.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.3 mph |
| 45 mph | 45.4 mph |
| 60 mph | 60.6 mph |
| 70 mph | 70.6 mph |
| 80 mph | 80.7 mph |
Other sizes close to 235/65R16
- 235/65R16 vs 225/75R16+4.50%
- 235/65R16 vs 235/70R16+3.30%
- 235/65R16 vs 215/65R16-3.65%
- 235/65R16 vs 235/60R17+0.27%
- 235/65R16 vs 215/70R16-0.63%
- 235/65R16 vs 215/65R17-0.08%
- 235/65R16 vs 225/60R16-4.99%
- 235/65R16 vs 225/70R16+1.33%
- 235/65R16 vs 225/65R16-1.83%
- 235/65R16 vs 235/60R16-3.30%
- 235/65R16 vs 195/75R16-1.83%
- 235/65R16 vs 255/65R16+3.65%
Questions
Can I replace 235/65R16 with 225/75R15?
225/75R15 is a safe swap for 235/65R16 by the usual ±3% rule: the diameter differs by +0.93%.
What's the difference between 235/65R16 and 225/75R15?
225/75R15 is 0.26" taller and 10 mm narrower; the sidewall is +0.63". At an indicated 60 mph you'd actually be doing 60.6 mph.
Will 225/75R15 fit on 235/65R16 wheels?
No — 235/65R16 needs a 16" wheel and 225/75R15 a 15" wheel. This is a plus/minus-size swap that changes wheels too.