Comparison of tire sizes 185/70 R13 and 175/65 R15
185/70R13
185
Tire width 
70
Profile height 
R13
Tire diameter 
540
RPM per km 185mm130mm589mm1851mm
185
70
13
175
65
15
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 589 | 609 | +20 (+3.4%) | ||
| Width, mm | 185 | 175 | -10 (-5.4%) | ||
| Circumference, mm | 1851 | 1912 | +61 (+3.3%) | ||
| Profile height, mm | 130 | 114 | -16 (-12.3%) | ||
| RPM per km | 540 | 523 | -17 (-3.1%) | ||
| Clearance change, mm | +10 | ||||
| Result: | The diameter differs by 3.4%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 103.3 |
| Difference (km/h) | 3.3 |
Sizes for comparison of tires 185/70 R13
R13
R14 +1
R15 +2
Sizes for comparison of tires 175/65 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2