Comparison of tire sizes 255/70 R18 and 275/65 R18
255/70R18
255
Tire width 
70
Profile height 
R18
Tire diameter 
391
RPM per km 255mm179mm814mm2558mm
255
70
18
275
65
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 814 | 815 | +1 (+0.1%) | ||
| Width, mm | 255 | 275 | +20 (+7.8%) | ||
| Circumference, mm | 2558 | 2559 | +1 (+0%) | ||
| Profile height, mm | 179 | 179 | 0 (0%) | ||
| RPM per km | 391 | 391 | 0 (0%) | ||
| Clearance change, mm | +1 | ||||
| Result: | The diameter differs by 0.1%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 100 |
| Difference (km/h) | 0 |
Sizes for comparison of tires 255/70 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 275/65 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
