Comparison of tire sizes 305/45 R20 and 295/50 R20
305/45R20
305
Tire width 
45
Profile height 
R20
Tire diameter 
407
RPM per km 305mm137mm783mm2458mm
305
45
20
295
50
20
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 783 | 803 | +20 (+2.6%) | ||
| Width, mm | 305 | 295 | -10 (-3.3%) | ||
| Circumference, mm | 2458 | 2523 | +65 (+2.6%) | ||
| Profile height, mm | 137 | 148 | +11 (+8%) | ||
| RPM per km | 407 | 396 | -11 (-2.7%) | ||
| Clearance change, mm | +10 | ||||
| Result: | The diameter differs by 2.6%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 102.6 |
| Difference (km/h) | 2.6 |
Sizes for comparison of tires 305/45 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2
Sizes for comparison of tires 295/50 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2