Comparison of tire sizes 175/55 R15 and 205/40 R17
175/55R15
175
Tire width 
55
Profile height 
R15
Tire diameter 
555
RPM per km 175mm96mm574mm1802mm
175
55
15
205
40
17
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 574 | 596 | +22 (+3.8%) | ||
| Width, mm | 175 | 205 | +30 (+17.1%) | ||
| Circumference, mm | 1802 | 1872 | +70 (+3.9%) | ||
| Profile height, mm | 96 | 82 | -14 (-14.6%) | ||
| RPM per km | 555 | 534 | -21 (-3.8%) | ||
| Clearance change, mm | +11 | ||||
| Result: | The diameter differs by 3.8%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 103.9 |
| Difference (km/h) | 3.9 |
Sizes for comparison of tires 175/55 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2
Sizes for comparison of tires 205/40 R17
R17
R16 -1
R18 +1
R15 -2