Comparison of tire sizes 305/50 R20 and 275/50 R22
305/50R20
305
Tire width 
50
Profile height 
R20
Tire diameter 
392
RPM per km 305mm153mm813mm2554mm
305
50
20
275
50
22
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 813 | 834 | +21 (+2.6%) | ||
| Width, mm | 305 | 275 | -30 (-9.8%) | ||
| Circumference, mm | 2554 | 2619 | +65 (+2.5%) | ||
| Profile height, mm | 153 | 138 | -15 (-9.8%) | ||
| RPM per km | 392 | 382 | -10 (-2.6%) | ||
| Clearance change, mm | +11 | ||||
| Result: | The diameter differs by 2.6%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 102.5 |
| Difference (km/h) | 2.5 |
Sizes for comparison of tires 305/50 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2
Sizes for comparison of tires 275/50 R22
R22
R20 -2
