235/60R17 vs 255/60R17
255/60R17 is outside the ±3% rule as a replacement for 235/60R17: the diameter differs by +3.36%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 255/60R17 on a car calibrated for 235/60R17, the speedometer reads 58.0 mph when you're really doing 60, and the odometer under-counts by 3.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.0 mph |
| 45 mph | 46.5 mph |
| 60 mph | 62.0 mph |
| 70 mph | 72.4 mph |
| 80 mph | 82.7 mph |
Other sizes close to 235/60R17
- 235/60R17 vs 225/55R17-4.83%
- 235/60R17 vs 225/65R17+1.47%
- 235/60R17 vs 235/55R18+0.27%
- 235/60R17 vs 235/65R17+3.29%
- 235/60R17 vs 235/55R17-3.29%
- 235/60R17 vs 225/60R17-1.68%
- 235/60R17 vs 215/65R17-0.35%
- 235/60R17 vs 215/70R16-0.90%
- 235/60R17 vs 215/60R17-3.36%
- 235/60R17 vs 235/65R16-0.27%
- 235/60R17 vs 275/55R17+2.87%
Questions
Can I replace 235/60R17 with 255/60R17?
255/60R17 is outside the ±3% rule as a replacement for 235/60R17: the diameter differs by +3.36%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 235/60R17 and 255/60R17?
255/60R17 is 0.94" taller and 20 mm wider; the sidewall is +0.47". At an indicated 60 mph you'd actually be doing 62.0 mph.
Will 255/60R17 fit on 235/60R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 255 mm tire and the fender clearance.