255/60R17 vs 235/70R17
235/70R17 is outside the ±3% rule as a replacement for 255/60R17: the diameter differs by +3.12%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 235/70R17 on a car calibrated for 255/60R17, the speedometer reads 58.2 mph when you're really doing 60, and the odometer under-counts by 3.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.9 mph |
| 45 mph | 46.4 mph |
| 60 mph | 61.9 mph |
| 70 mph | 72.2 mph |
| 80 mph | 82.5 mph |
Other sizes close to 255/60R17
- 255/60R17 vs 235/60R18+0.19%
- 255/60R17 vs 225/65R17-1.83%
- 255/60R17 vs 235/65R17-0.07%
- 255/60R17 vs 225/60R17-4.88%
- 255/60R17 vs 245/65R17+1.69%
- 255/60R17 vs 255/55R18-0.01%
- 255/60R17 vs 225/75R16+0.83%
- 255/60R17 vs 235/70R16-0.33%
- 255/60R17 vs 235/60R17-3.25%
- 255/60R17 vs 215/65R17-3.59%
- 255/60R17 vs 255/65R17+3.46%
- 255/60R17 vs 255/65R16+0.01%
Questions
Can I replace 255/60R17 with 235/70R17?
235/70R17 is outside the ±3% rule as a replacement for 255/60R17: the diameter differs by +3.12%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 255/60R17 and 235/70R17?
235/70R17 is 0.91" taller and 20 mm narrower; the sidewall is +0.45". At an indicated 60 mph you'd actually be doing 61.9 mph.
Will 235/70R17 fit on 255/60R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 235 mm tire and the fender clearance.