Comparison of tire sizes 235/55 R20 and 245/50 R20
235/55R20
235
Tire width 
55
Profile height 
R20
Tire diameter 
415
RPM per km 235mm129mm767mm2408mm
235
55
20
245
50
20
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 767 | 753 | -14 (-1.8%) | ||
| Width, mm | 235 | 245 | +10 (+4.3%) | ||
| Circumference, mm | 2408 | 2366 | -42 (-1.7%) | ||
| Profile height, mm | 129 | 123 | -6 (-4.7%) | ||
| RPM per km | 415 | 423 | +8 (+1.9%) | ||
| Clearance change, mm | -7 | ||||
| Result: | The diameter differs by -1.8%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 98.3 |
| Difference (km/h) | -1.7 |
Sizes for comparison of tires 235/55 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2
Sizes for comparison of tires 245/50 R20
R20
R19 -1
R21 +1
R18 -2
R22 +2
