Comparison of tire sizes 175/65 R14 and 185/55 R15
175/65R14
175
Tire width 
65
Profile height 
R14
Tire diameter 
546
RPM per km 175mm114mm583mm1832mm
175
65
14
185
55
15
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 583 | 585 | +2 (+0.3%) | ||
| Width, mm | 175 | 185 | +10 (+5.7%) | ||
| Circumference, mm | 1832 | 1836 | +4 (+0.2%) | ||
| Profile height, mm | 114 | 102 | -12 (-10.5%) | ||
| RPM per km | 546 | 545 | -1 (-0.2%) | ||
| Clearance change, mm | +1 | ||||
| Result: | The diameter differs by 0.3%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 100.2 |
| Difference (km/h) | 0.2 |
Sizes for comparison of tires 175/65 R14
R14
R13 -1
R15 +1
R16 +2
Sizes for comparison of tires 185/55 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2