245/65R17 vs 225/75R17
225/75R17 is a safe swap for 245/65R17 by the usual ±3% rule: the diameter differs by +2.53%.
Speedometer and odometer
With 225/75R17 on a car calibrated for 245/65R17, the speedometer reads 58.5 mph when you're really doing 60, and the odometer under-counts by 2.5%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.8 mph |
| 45 mph | 46.1 mph |
| 60 mph | 61.5 mph |
| 70 mph | 71.8 mph |
| 80 mph | 82.0 mph |
Other sizes close to 245/65R17
- 245/65R17 vs 225/65R17-3.47%
- 245/65R17 vs 235/65R17-1.73%
- 245/65R17 vs 245/70R17+3.27%
- 245/65R17 vs 245/60R18+0.12%
- 245/65R17 vs 225/75R16-0.85%
- 245/65R17 vs 265/65R17+3.47%
- 245/65R17 vs 235/60R17-4.86%
- 245/65R17 vs 245/70R16-0.12%
- 245/65R17 vs 255/65R17+1.73%
- 245/65R17 vs 235/75R17+4.53%
- 245/65R17 vs 235/70R17+1.40%
- 245/65R17 vs 255/60R17-1.67%
Questions
Can I replace 245/65R17 with 225/75R17?
225/75R17 is a safe swap for 245/65R17 by the usual ±3% rule: the diameter differs by +2.53%.
What's the difference between 245/65R17 and 225/75R17?
225/75R17 is 0.75" taller and 20 mm narrower; the sidewall is +0.37". At an indicated 60 mph you'd actually be doing 61.5 mph.
Will 225/75R17 fit on 245/65R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 225 mm tire and the fender clearance.