Bicycle antitheft control device, shifting device and shifting system

摘要

A bicycle antitheft device includes an antitheft mechanism switchable between an antitheft state and a release state, wherein the antitheft mechanism includes an annular member (161,161a) that rotates coaxially about a bicycle handlebar (15). A movement controlling mechanism (163) hinders the annular member (161,161a) from moving relative to the handlebar (15) when the antitheft mechanism is in the antitheft state, and a selection mechanism (161,161a) is provided for selecting one of the antitheft state and the release state.