The selector cable is moved in an axial direction when a gear is selected with the gear lever. In the internal gearshift mechanism, this axial movement translates into the selection of the shift slot.
The shift cable is also moved in an axial direction when a gear is selected with the gear lever. In the internal gearshift mechanism, this axial movement is used to engage the corresponding gear.
The selector cable is marked black and the shift cable is marked white.