A locking mechanism assembly for a flexible towing device for single-track vehicles, which the flexible towing device comprises a towing element assembly and a locking mechanism assembly , wherein the locking mechanism assembly is adapted for mounting on a single-track vehicle, the locking mechanism assembly comprising: a first portion of the body, comprising a half-seat means , a second portion of the body, comprising a half-seat means , wherein the half-seats means of the corresponding first and second portion of the body form together a seat , the seat being configured for detachable coupling the towing element assembly , wherein the seat of the locking mechanism assembly is configured to assure a release force (F) for releasing the towing element assembly when said release force (F) is applied to the locking mechanism assembly via said towing element assembly , a first axis arranged in substantially the main direction of the locking mechanism assembly and defining a main axis (O R ) of said mechanism said main axis (O R ) extending in the same direction as the main axis (O) of said single-track vehicle when said locking mechanism is mounted on said single-track vehicle, a second axis arranged laterally to the main direction of the locking mechanism assembly and defining a lateral axis (O B ) of said mechanism , characterized in that the half-seat means of the first portion of the body seat and the half-seat means of the second portion of the body are configured to assure to said seat said release force (F) being a first release force (Fo) substantially along the main axis (O R ) and a second release force (F B ) substantially along the lateral axis (O B ), wherein the second release force (F B ) is smaller than the first release force (F O ) or the second release force (F B ) is equal substantially zero. a first portion of the body, comprising a half-seat means , a second portion of the body, comprising a half-seat means , wherein the half-seats means of the corresponding first and second portion of the body form together a seat , the seat being configured for detachable coupling the towing element assembly , wherein the seat of the locking mechanism assembly is configured to assure a release force (F) for releasing the towing element assembly when said release force (F) is applied to the locking mechanism assembly via said towing element assembly , a first axis arranged in substantially the main direction of the locking mechanism assembly and defining a main axis (O R ) of said mechanism said main axis (O R ) extending in the same direction as the main axis (O) of said single-track vehicle when said locking mechanism is mounted on said single-track vehicle, a second axis arranged laterally to the main direction of the locking mechanism assembly and defining a lateral axis (O B ) of said mechanism , characterized in that the half-seat means of the first portion of the body seat and the half-seat means of the second portion of the body are configured to assure to said seat said release force (F) being a first release force (Fo) substantially along the main axis (O R ) and a second release force (F B ) substantially along the lateral axis (O B ), wherein the second release force (F B ) is smaller than the first release force (F O ) or the second release force (F B ) is equal substantially zero. <EOS>