Comparison of tire sizes 185/55 R15 and 175/55 R15
185/55R15
185
Tire width 
55
Profile height 
R15
Tire diameter 
545
RPM per km 185mm102mm585mm1836mm
185
55
15
175
55
15
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 585 | 574 | -11 (-1.9%) | ||
| Width, mm | 185 | 175 | -10 (-5.4%) | ||
| Circumference, mm | 1836 | 1802 | -34 (-1.9%) | ||
| Profile height, mm | 102 | 96 | -6 (-5.9%) | ||
| RPM per km | 545 | 555 | +10 (+1.8%) | ||
| Clearance change, mm | -6 | ||||
| Result: | The diameter differs by -1.9%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 98.1 |
| Difference (km/h) | -1.9 |
Sizes for comparison of tires 185/55 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2
Sizes for comparison of tires 175/55 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2