Comparison of tire sizes 265/50 R20 and 255/55 R20
265/50R20
265
Tire width 
50
Profile height 
R20
Tire diameter 
412
RPM per km 265mm133mm773mm2428mm
265
50
20
255
55
20
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 773 | 789 | +16 (+2.1%) | ||
| Width, mm | 265 | 255 | -10 (-3.8%) | ||
| Circumference, mm | 2428 | 2477 | +49 (+2%) | ||
| Profile height, mm | 133 | 140 | +7 (+5.3%) | ||
| RPM per km | 412 | 404 | -8 (-1.9%) | ||
| Clearance change, mm | +8 | ||||
| Result: | The diameter differs by 2.1%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 102 |
| Difference (km/h) | 2 |
Sizes for comparison of tires 265/50 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2
Sizes for comparison of tires 255/55 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2