A tubeless pneumatic tyre including a carcass (11,16,22) having a carcass cord web (12) and topping rubber layers covering the opposite sides of the carcass cord web, the carcass (11) extending from a tread portion through a sidewall portion to a bead portion and turned up around a bead core outwardly from the inside of the tyre in the axial direction of the tyre, wherein only the inner one layer (13a) of the topping rubber layers which faces the inside of the tyre is made of a butyl-based rubber. The tubeless pneumatic tyre is of lightened weight and exhibits anti-airleak property comparable or superior to that of conventional tyres even when it has no inner liner. <IMAGE>
