A heavy duty dual tire assembly

A heavy duty dual tire assembly (10) for mounting on dual rims (2) is disclosed. The assembly has a pair of tires (14) and a pair of separate removable annular tread belts (12) for mounting over both tires (14) the pair of separate removable annual tread belts (12) bridge the gap between the tires (10) when they are laterally adjacent and coaxially aligned by mounting on a dual rim. In one embodiment there is a separated tread belt spacer (9) that is interposed between tread belts (12) to, in combination with the tread belts, bridge the gap between the tires.