255/65R17 vs 235/75R17
235/75R17 is a safe swap for 255/65R17 by the usual ±3% rule: the diameter differs by +2.75%.
Speedometer and odometer
With 235/75R17 on a car calibrated for 255/65R17, the speedometer reads 58.4 mph when you're really doing 60, and the odometer under-counts by 2.8%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.8 mph |
| 45 mph | 46.2 mph |
| 60 mph | 61.7 mph |
| 70 mph | 71.9 mph |
| 80 mph | 82.2 mph |
Other sizes close to 255/65R17
- 255/65R17 vs 235/65R17-3.41%
- 255/65R17 vs 245/70R17+1.51%
- 255/65R17 vs 245/65R17-1.70%
- 255/65R17 vs 245/75R17+4.72%
- 255/65R17 vs 235/65R18-0.08%
- 255/65R17 vs 265/65R17+1.70%
- 255/65R17 vs 255/70R16+0.01%
- 255/65R17 vs 255/70R17+3.34%
- 255/65R17 vs 255/60R18-0.01%
- 255/65R17 vs 235/70R17-0.33%
- 255/65R17 vs 235/75R16-0.58%
- 255/65R17 vs 255/60R17-3.34%
Questions
Can I replace 255/65R17 with 235/75R17?
235/75R17 is a safe swap for 255/65R17 by the usual ±3% rule: the diameter differs by +2.75%.
What's the difference between 255/65R17 and 235/75R17?
235/75R17 is 0.83" taller and 20 mm narrower; the sidewall is +0.41". At an indicated 60 mph you'd actually be doing 61.7 mph.
Will 235/75R17 fit on 255/65R17 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.