255/65R17 vs 265/70R17
265/70R17 is outside the ±3% rule as a replacement for 255/65R17: the diameter differs by +5.17%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 265/70R17 on a car calibrated for 255/65R17, the speedometer reads 57.0 mph when you're really doing 60, and the odometer under-counts by 5.2%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.6 mph |
| 45 mph | 47.3 mph |
| 60 mph | 63.1 mph |
| 70 mph | 73.6 mph |
| 80 mph | 84.1 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 235/75R17+2.75%
- 255/65R17 vs 235/70R17-0.33%
- 255/65R17 vs 235/75R16-0.58%
Questions
Can I replace 255/65R17 with 265/70R17?
265/70R17 is outside the ±3% rule as a replacement for 255/65R17: the diameter differs by +5.17%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 255/65R17 and 265/70R17?
265/70R17 is 1.56" taller and 10 mm wider; the sidewall is +0.78". At an indicated 60 mph you'd actually be doing 63.1 mph.
Will 265/70R17 fit on 255/65R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 265 mm tire and the fender clearance.