Comparison of tire sizes 185/65 R14 and 155/60 R15
185/65R14
185
Tire width 
65
Profile height 
R14
Tire diameter 
534
RPM per km 185mm120mm596mm1873mm
185
65
14
155
60
15
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 596 | 567 | -29 (-4.9%) | ||
| Width, mm | 185 | 155 | -30 (-16.2%) | ||
| Circumference, mm | 1873 | 1781 | -92 (-4.9%) | ||
| Profile height, mm | 120 | 93 | -27 (-22.5%) | ||
| RPM per km | 534 | 561 | +27 (+5.1%) | ||
| Clearance change, mm | -15 | ||||
| Result: | The diameter differs by -4.9%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 95.1 |
| Difference (km/h) | -4.9 |
Sizes for comparison of tires 185/65 R14
R14
R13 -1
R15 +1
R16 +2
Sizes for comparison of tires 155/60 R15
R15
R14 -1
R16 +1
R13 -2