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 (55, 57) of the corresponding first and second portion (54, 56) 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 for releasing the towing element assembly when said release force 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 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 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 (55, 57) of the corresponding first and second portion (54, 56) 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 for releasing the towing element assembly when said release force 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 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 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.