Comparison of tire sizes 175/65 R15 and 205/50 R15
175/65R15
175
Tire width 
65
Profile height 
R15
Tire diameter 
523
RPM per km 175mm114mm609mm1912mm
175
65
15
205
50
15
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 609 | 586 | -23 (-3.8%) | ||
| Width, mm | 175 | 205 | +30 (+17.1%) | ||
| Circumference, mm | 1912 | 1841 | -71 (-3.7%) | ||
| Profile height, mm | 114 | 103 | -11 (-9.6%) | ||
| RPM per km | 523 | 543 | +20 (+3.8%) | ||
| Clearance change, mm | -12 | ||||
| Result: | The diameter differs by -3.8%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 96.3 |
| Difference (km/h) | -3.7 |
Sizes for comparison of tires 175/65 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2
Sizes for comparison of tires 205/50 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2