225/75R17 vs 245/75R17
245/75R17 is outside the ±3% rule as a replacement for 225/75R17: the diameter differs by +3.90%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 245/75R17 on a car calibrated for 225/75R17, the speedometer reads 57.7 mph when you're really doing 60, and the odometer under-counts by 3.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.2 mph |
| 45 mph | 46.8 mph |
| 60 mph | 62.3 mph |
| 70 mph | 72.7 mph |
| 80 mph | 83.1 mph |
Other sizes close to 225/75R17
- 225/75R17 vs 265/70R17+4.35%
- 225/75R17 vs 235/65R17-4.16%
- 225/75R17 vs 265/60R18+0.77%
- 225/75R17 vs 245/70R17+0.71%
- 225/75R17 vs 245/65R17-2.47%
- 225/75R17 vs 245/75R16+0.60%
- 225/75R17 vs 235/65R18-0.86%
- 225/75R17 vs 265/65R17+0.91%
- 225/75R17 vs 255/65R17-0.78%
- 225/75R17 vs 215/85R16+0.34%
- 225/75R17 vs 255/70R16-0.77%
- 225/75R17 vs 255/70R17+2.53%
Questions
Can I replace 225/75R17 with 245/75R17?
245/75R17 is outside the ±3% rule as a replacement for 225/75R17: the diameter differs by +3.90%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 225/75R17 and 245/75R17?
245/75R17 is 1.18" taller and 20 mm wider; the sidewall is +0.59". At an indicated 60 mph you'd actually be doing 62.3 mph.
Will 245/75R17 fit on 225/75R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 245 mm tire and the fender clearance.