A varying-track wheel with a dowel-pin centring system

A varying-track wheel comprises a rim (11) with fastening elements (12) projecting towards the rotation axis of the wheel and a disc (14) peripherally secured in a removable manner to said fastening elements by means of bolts (15). The wheel comprises at least two devices (16) for a precise mutual positioning of the disc and rim. Each of such devices is operatively disposed close to one of said fastening elements (12) and in turn comprises a tubular seat (17) on the fastening element (12) to removably receive one end of a dowel pin (18) the other end of which projects towards the disc to be fitted into a centring hole (19) formed in the periphery of the disc itself.