Patent ID: 8800367

Claim:
A sensor module, for mounting on a rear fork of a bicycle, comprising: a housing having an opposite first end and a second end, wherein a switch member is arranged on the first end and a mounting seat is recessed on the second end, wherein a retaining structure is arranged on the mounting seat, wherein the retaining structure has a plurality of retaining holes formed thereon; a spool piece arranged on the mounting seat, wherein the spool piece has at least one protrusion for engaging the retaining holes; a spool cap having an opening formed thereon for exposing the spool piece, wherein the spool cap is mounted on the edge portion of the mounting seat; a cable capable of being rewound into the spool piece; and a sensing element connected to the spool piece through the cable, wherein the sensing element and the housing are mounted on the rear fork of the bicycle, with the distance between the sensing element and the housing being adjustable by the windable cable.