265/60R18 vs 255/70R18
255/70R18 is outside the ±3% rule as a replacement for 265/60R18: the diameter differs by +5.03%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 255/70R18 on a car calibrated for 265/60R18, the speedometer reads 57.1 mph when you're really doing 60, and the odometer under-counts by 5.0%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.5 mph |
| 45 mph | 47.3 mph |
| 60 mph | 63.0 mph |
| 70 mph | 73.5 mph |
| 80 mph | 84.0 mph |
Other sizes close to 265/60R18
- 265/60R18 vs 235/60R18-4.64%
- 265/60R18 vs 245/70R17-0.05%
- 265/60R18 vs 245/60R18-3.10%
- 265/60R18 vs 255/55R18-4.84%
- 265/60R18 vs 265/65R18+3.42%
- 265/60R18 vs 235/65R18-1.61%
- 265/60R18 vs 265/65R17+0.14%
- 265/60R18 vs 255/65R18+1.74%
- 265/60R18 vs 255/60R18-1.55%
- 265/60R18 vs 285/60R18+3.10%
- 265/60R18 vs 275/60R18+1.55%
- 265/60R18 vs 265/55R19-0.14%
Questions
Can I replace 265/60R18 with 255/70R18?
255/70R18 is outside the ±3% rule as a replacement for 265/60R18: the diameter differs by +5.03%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 265/60R18 and 255/70R18?
255/70R18 is 1.54" taller and 10 mm narrower; the sidewall is +0.77". At an indicated 60 mph you'd actually be doing 63.0 mph.
Will 255/70R18 fit on 265/60R18 wheels?
Both use a 18" rim, so the wheel diameter matches; check the wheel's width range for a 255 mm tire and the fender clearance.