Comparison of tire sizes 255/40 R17 and 225/40 R17
255/40R17
255
Tire width 
40
Profile height 
R17
Tire diameter 
501
RPM per km 255mm102mm636mm1997mm
255
40
17
225
40
17
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 636 | 612 | -24 (-3.8%) | ||
| Width, mm | 255 | 225 | -30 (-11.8%) | ||
| Circumference, mm | 1997 | 1922 | -75 (-3.8%) | ||
| Profile height, mm | 102 | 90 | -12 (-11.8%) | ||
| RPM per km | 501 | 520 | +19 (+3.8%) | ||
| Clearance change, mm | -12 | ||||
| Result: | The diameter differs by -3.8%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 96.2 |
| Difference (km/h) | -3.8 |
Sizes for comparison of tires 255/40 R17
R17
R16 -1
R18 +1
R15 -2
R19 +2
Sizes for comparison of tires 225/40 R17
R17
R16 -1
R18 +1
R15 -2
R19 +2