Comparison of tire sizes 225/45 R17 and 205/40 R18

225/45R17




225mm101mm634mm1993mm
225
45
17
205
40
18
Parameters Sizes | Old | New | |||
---|---|---|---|---|---|
Diameter, mm | 634 | 621 | -13 (-2.1%) | ||
Width, mm | 225 | 205 | -20 (-8.9%) | ||
Circumference, mm | 1993 | 1952 | -41 (-2.1%) | ||
Profile height, mm | 101 | 82 | -19 (-18.8%) | ||
RPM per km | 502 | 512 | +10 (+2%) | ||
Clearance change, mm | -7 | ||||
Result: | The diameter differs by -2.1%. |
Speedometer reading (km/h) | |
---|---|
Real speed (km/h) | 97.9 |
Difference (km/h) | -2.1 |
Sizes for comparison of tires 225/45 R17
R17
R16 -1
R18 +1
R15 -2
R19 +2
Sizes for comparison of tires 205/40 R18
R18
R17 -1
R19 +1
R16 -2