Comparison of tire sizes 185/55 R15 and 165/70 R13
185/55R15
185
Tire width 
55
Profile height 
R15
Tire diameter 
545
RPM per km 185mm102mm585mm1836mm
185
55
15
165
70
13
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 585 | 561 | -24 (-4.1%) | ||
| Width, mm | 185 | 165 | -20 (-10.8%) | ||
| Circumference, mm | 1836 | 1763 | -73 (-4%) | ||
| Profile height, mm | 102 | 115 | +13 (+12.7%) | ||
| RPM per km | 545 | 567 | +22 (+4%) | ||
| Clearance change, mm | -12 | ||||
| Result: | The diameter differs by -4.1%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 96 |
| Difference (km/h) | -4 |
Sizes for comparison of tires 185/55 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2
Sizes for comparison of tires 165/70 R13
R13
R14 +1
R15 +2