265/60R18 vs 255/65R18
255/65R18 is a safe swap for 265/60R18 by the usual ±3% rule: the diameter differs by +1.74%.
Speedometer and odometer
With 255/65R18 on a car calibrated for 265/60R18, the speedometer reads 59.0 mph when you're really doing 60, and the odometer under-counts by 1.7%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.5 mph |
| 45 mph | 45.8 mph |
| 60 mph | 61.0 mph |
| 70 mph | 71.2 mph |
| 80 mph | 81.4 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 255/60R18-1.55%
- 265/60R18 vs 285/60R18+3.10%
- 265/60R18 vs 275/60R18+1.55%
- 265/60R18 vs 265/55R19-0.14%
- 265/60R18 vs 225/75R17-0.76%
Questions
Can I replace 265/60R18 with 255/65R18?
255/65R18 is a safe swap for 265/60R18 by the usual ±3% rule: the diameter differs by +1.74%.
What's the difference between 265/60R18 and 255/65R18?
255/65R18 is 0.53" taller and 10 mm narrower; the sidewall is +0.27". At an indicated 60 mph you'd actually be doing 61.0 mph.
Will 255/65R18 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.