Cable routing assembly

A cable routing assembly, disposed on a headset of a bicycle and having a through hole fitting around a steerer tube of the bicycle, comprising:

• a top annular base having a first through hole and a first cable groove;
• and
• a bottom annular base having a second through hole and a second cable groove;
• when the top annular base is engaged with the bottom annular base, the top annular base and the bottom annular base jointly form an internal space, and the first cable groove and the second cable groove jointly surround to form a cable channel, wherein the cable channel communicates between an external space and the internal space;
• the first through hole and the second through hole communicate with each other to form the through hole of the cable routing assembly;
• wherein an axial direction and a channel direction are respectively defined;
• the through hole of the cable routing assembly extends along the axial direction, and the cable channel extends along the channel direction;
• the axial direction and the channel direction not parallel to each other.