Comparison of tire sizes 275/60 R20 and 275/70 R18
275/60R20
275
Tire width 
60
Profile height 
R20
Tire diameter 
380
RPM per km 275mm165mm838mm2633mm
275
60
20
275
70
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 838 | 842 | +4 (+0.5%) | ||
| Width, mm | 275 | 275 | 0 (0%) | ||
| Circumference, mm | 2633 | 2646 | +13 (+0.5%) | ||
| Profile height, mm | 165 | 193 | +28 (+17%) | ||
| RPM per km | 380 | 378 | -2 (-0.5%) | ||
| Clearance change, mm | +2 | ||||
| Result: | The diameter differs by 0.5%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 100.5 |
| Difference (km/h) | 0.5 |
Sizes for comparison of tires 275/60 R20
R20
R18 -2
R22 +2
Sizes for comparison of tires 275/70 R18
R18
R17 -1
R16 -2
R20 +2
