Comparison of tire sizes 185/55 R15 and 225/50 R15
185/55R15
185
Tire width 
55
Profile height 
R15
Tire diameter 
545
RPM per km 185mm102mm585mm1836mm
185
55
15
225
50
15
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 585 | 606 | +21 (+3.6%) | ||
| Width, mm | 185 | 225 | +40 (+21.6%) | ||
| Circumference, mm | 1836 | 1904 | +68 (+3.7%) | ||
| Profile height, mm | 102 | 113 | +11 (+10.8%) | ||
| RPM per km | 545 | 525 | -20 (-3.7%) | ||
| Clearance change, mm | +11 | ||||
| Result: | The diameter differs by 3.6%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 103.7 |
| Difference (km/h) | 3.7 |
Sizes for comparison of tires 185/55 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2
Sizes for comparison of tires 225/50 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2