The wheel rim (1), consisting of side walls and upper and lower transverse walls with holes (25) at regular intervals for spoke fastenings, has the lower transverse wall and side walls made with a nominal thickness in the zone (26, 27) of the holes, reduci...

The sensor consists of a rectangular compartment (29) which contains a round lozenge (28) able to open and close a reed relay (26) at each turn of the compartment. Circuits (34-38) measure the average speed of the sensor signal over a chosen time and conve...

The hub comprises two lateral cheek webs (3,4) with buttonhole shaped drillings (10) with large (14) and small (15) sections for fastening of the spokes. Each cheek web comprises an approximately shank (6) extended by a disc (7). The buttonhole large secti...

The attaching organ (22) is made of a hollow tube (24) externally threaded (25) and of a projection (26), which is attached on a strip (27) cut in the tube and can be deformed either axially and radially. The stroke' end is in contact with a plane inside t...