Comparison of tire sizes 255/50 R20 and 235/55 R20
255/50R20
255
Tire width 
50
Profile height 
R20
Tire diameter 
417
RPM per km 255mm128mm763mm2397mm
255
50
20
235
55
20
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 763 | 767 | +4 (+0.5%) | ||
| Width, mm | 255 | 235 | -20 (-7.8%) | ||
| Circumference, mm | 2397 | 2408 | +11 (+0.5%) | ||
| Profile height, mm | 128 | 129 | +1 (+0.8%) | ||
| RPM per km | 417 | 415 | -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 255/50 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2
Sizes for comparison of tires 235/55 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2
