Comparison of tire sizes 155/65 R15 and 185/60 R14
155/65R15
155
Tire width 
65
Profile height 
R15
Tire diameter 
546
RPM per km 155mm101mm583mm1830mm
155
65
15
185
60
14
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 583 | 578 | -5 (-0.9%) | ||
| Width, mm | 155 | 185 | +30 (+19.4%) | ||
| Circumference, mm | 1830 | 1815 | -15 (-0.8%) | ||
| Profile height, mm | 101 | 111 | +10 (+9.9%) | ||
| RPM per km | 546 | 551 | +5 (+0.9%) | ||
| Clearance change, mm | -3 | ||||
| Result: | The diameter differs by -0.9%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 99.2 |
| Difference (km/h) | -0.8 |
Sizes for comparison of tires 155/65 R15
R15
R14 -1
R16 +1
R13 -2
Sizes for comparison of tires 185/60 R14
R14
R13 -1
R15 +1
R16 +2