255/75R17 vs 295/70R17
295/70R17 is outside the ±3% rule as a replacement for 255/75R17: the diameter differs by +3.75%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 295/70R17 on a car calibrated for 255/75R17, the speedometer reads 57.8 mph when you're really doing 60, and the odometer under-counts by 3.7%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.1 mph |
| 45 mph | 46.7 mph |
| 60 mph | 62.2 mph |
| 70 mph | 72.6 mph |
| 80 mph | 83.0 mph |
Other sizes close to 255/75R17
- 255/75R17 vs 265/70R17-1.41%
- 255/75R17 vs 275/65R18+0.05%
- 255/75R17 vs 245/70R17-4.85%
- 255/75R17 vs 285/70R17+2.03%
- 255/75R17 vs 245/75R17-1.84%
- 255/75R17 vs 265/65R17-4.67%
- 255/75R17 vs 235/80R17-0.80%
- 255/75R17 vs 255/70R18-0.01%
- 255/75R17 vs 255/70R17-3.13%
- 255/75R17 vs 235/75R17-3.68%
- 255/75R17 vs 33x12.50R17+2.94%
- 255/75R17 vs 275/70R17+0.31%
Questions
Can I replace 255/75R17 with 295/70R17?
295/70R17 is outside the ±3% rule as a replacement for 255/75R17: the diameter differs by +3.75%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 255/75R17 and 295/70R17?
295/70R17 is 1.20" taller and 40 mm wider; the sidewall is +0.60". At an indicated 60 mph you'd actually be doing 62.2 mph.
Will 295/70R17 fit on 255/75R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 295 mm tire and the fender clearance.