Comparison of tire sizes 305/45 R22 and 305/50 R20
305/45R22
305
Tire width 
45
Profile height 
R22
Tire diameter 
382
RPM per km 305mm137mm833mm2618mm
305
45
22
305
50
20
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 833 | 813 | -20 (-2.4%) | ||
| Width, mm | 305 | 305 | 0 (0%) | ||
| Circumference, mm | 2618 | 2554 | -64 (-2.4%) | ||
| Profile height, mm | 137 | 153 | +16 (+11.7%) | ||
| RPM per km | 382 | 392 | +10 (+2.6%) | ||
| Clearance change, mm | -10 | ||||
| Result: | The diameter differs by -2.4%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 97.6 |
| Difference (km/h) | -2.4 |
Sizes for comparison of tires 305/45 R22
R22
R20 -2
Sizes for comparison of tires 305/50 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2