Comparison of tire sizes 255/55 R20 and 275/55 R20
255/55R20
255
Tire width 
55
Profile height 
R20
Tire diameter 
404
RPM per km 255mm140mm789mm2477mm
255
55
20
275
55
20
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 789 | 811 | +22 (+2.8%) | ||
| Width, mm | 255 | 275 | +20 (+7.8%) | ||
| Circumference, mm | 2477 | 2546 | +69 (+2.8%) | ||
| Profile height, mm | 140 | 151 | +11 (+7.9%) | ||
| RPM per km | 404 | 393 | -11 (-2.7%) | ||
| Clearance change, mm | +11 | ||||
| Result: | The diameter differs by 2.8%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 102.8 |
| Difference (km/h) | 2.8 |
Sizes for comparison of tires 255/55 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2
Sizes for comparison of tires 275/55 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2
