Comparison of tire sizes 255/70 R18 and 265/75 R16
255/70R18
255
Tire width 
70
Profile height 
R18
Tire diameter 
391
RPM per km 255mm179mm814mm2558mm
255
70
18
265
75
16
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 814 | 804 | -10 (-1.2%) | ||
| Width, mm | 255 | 265 | +10 (+3.9%) | ||
| Circumference, mm | 2558 | 2526 | -32 (-1.3%) | ||
| Profile height, mm | 179 | 199 | +20 (+11.2%) | ||
| RPM per km | 391 | 396 | +5 (+1.3%) | ||
| Clearance change, mm | -5 | ||||
| Result: | The diameter differs by -1.2%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 98.7 |
| Difference (km/h) | -1.3 |
Sizes for comparison of tires 255/70 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 265/75 R16
R16
R17 +1
R18 +2
