Lock positioning device for a bicycle

A positioning device for attaching a lock to a supporting post and comprising:

• a fastener attachable to said supporting post and having a base defining a vertical end face and a hole extending transversely therethrough, said base further defining a shaped recess in said vertical end face;
• a substantially U-shaped adjusting rack including first and second arms, said first arm defining a vertical face rotatably abutting said vertical end face of said fastener base and a bore extending transversely therethrough in alinement with said hole, and a flange corresponding in shape to said recess and protruding outwardly from said vertical face of said first arm and securely received in said recess, said flange being rotatably positionable relative to said recess when said flange is detached from said recess such that said first and second arms are rotatable and adjustable in a vertical plane relative to said fastener base;
• a positioning bolt mounted on an inner wall of said first arm and extending through said bore of said first arm and said hole of said fastener base;
• and
• a nut mounted on an inner wall of said fastener base and threadably engaged on said positioning bolt for tightening onto said bolt to hold said fastener and said adjusting rack securely together.