255/60R18 vs 265/60R18 at a glance
| Measure | 255/60R18 (current) | 265/60R18 (new) | Difference |
|---|---|---|---|
| Overall height | 30.05 in | 30.52 in | +0.47 in (+1.57%) |
| Width | 10.04 in (255 mm) | 10.43 in (265 mm) | +10 mm |
| Sidewall | 6.02 in | 6.26 in | +0.24 in |
| Wheel | 18 in | 18 in | +0 in |
| Circumference | 94.4 in | 95.9 in | +1.5 in |
| Revs per mile | 671.2 | 660.8 | −10.4 |
Verdict: close match
Within the 3% rule of thumb, so the speedometer, gearing and ride height change little. Going from 255/60R18 to 265/60R18 is a 1.6% increase in overall height (+0.47 in), and the vehicle sits about 0.24 in higher. The tire is 10 mm wider. The 3% rule of thumb comes from Discount Tire and 1010tires; it is not a guarantee of fit.
True speed and odometer
| Speedometer shows | You are really doing | Difference |
|---|---|---|
| 35 mph | 35.6 mph | +0.6 mph |
| 45 mph | 45.7 mph | +0.7 mph |
| 55 mph | 55.9 mph | +0.9 mph |
| 60 mph | 60.9 mph | +0.9 mph |
| 65 mph | 66.0 mph | +1.0 mph |
| 70 mph | 71.1 mph | +1.1 mph |
| 75 mph | 76.2 mph | +1.2 mph |
Odometer: 1,000 indicated miles is 1,016 real miles, and 10,000 is 10,157.
The math
255/60R18: 18 + 2 × (255 × 60% ÷ 25.4) = 30.05 in. 265/60R18: 18 + 2 × (265 × 60% ÷ 25.4) = 30.52 in. Change = 30.52 ÷ 30.05 − 1 = +1.57%. True speed at 60 = 60 × 30.52 ÷ 30.05 = 60.94 mph.
Check next
- Regear and RPM at cruise for this swap
- Speedometer and odometer correction
- Other sizes within ±3% of 255/60R18
Calculated from the size alone. Real tires vary a little by brand and model, and the loaded radius is a bit smaller. Confirm the wheel width range, clearance, load index and speed rating for your vehicle. See how to read a tire size, the load index chart and the speed rating chart.
Size pages: 255/60R18 · 265/60R18. More swaps: all tire size comparisons.