Comparison of tire sizes 265/60 R18 and 255/70 R18
265/60R18
265
Tire width 
60
Profile height 
R18
Tire diameter 
411
RPM per km 265mm159mm775mm2435mm
265
60
18
255
70
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 775 | 814 | +39 (+5%) | ||
| Width, mm | 265 | 255 | -10 (-3.8%) | ||
| Circumference, mm | 2435 | 2558 | +123 (+5.1%) | ||
| Profile height, mm | 159 | 179 | +20 (+12.6%) | ||
| RPM per km | 411 | 391 | -20 (-4.9%) | ||
| Clearance change, mm | +20 | ||||
| Result: | The diameter differs by 5%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 105.1 |
| Difference (km/h) | 5.1 |
Sizes for comparison of tires 265/60 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 255/70 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2