Attachment system for the spokes of a bicycle wheel

An attachment system for spokes in a bicycle wheel is described that is improved since it involves the need for simple non-threaded seat holes (11) of an as small as possible size (D1), still allowing easy assembly and adjustment of the tension of the spokes (8). The system comprises a spoke attachment element (9) of the nut type, configured to be maneuvered at the head end surface by a tool that does not transversally project from the spoke attachment element (9) itself since the maximum transverse size (D4) of the body (12) of the spoke attachment element (9) is defined by side surface portions of said body (12) other than tool engagement surfaces.