Sigma BC 1009 STS Mode D'emploi page 28

6.4 Wheel size chart (Radgröße / Wheel size / Circonference de roue)
A
B
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mm x 3,14
1x
km/h:
WS = mm x 3,14
mph:
WS = mm x 3,14
km/h:
WS = mm
mph:
WS = mm
= WS (mm)