A pneumatic radial ply tire 100 for use on aircraft has a radial reinforced carcass 20 having at least one axially inner ply 2A, 2B, 2C and 2D of textile cords 21 wound around a pair of bead cores 33. The improved bead structure 30 has a flipper 50 having an axially inner leg L.sub.I and axially outer leg L.sub.E. The ends L.sub.I, L.sub.E of the flippers 50 are above the bead core height B.sub.h and below the apex A of an elastomeric strip 40 satisfying the relation B.sub.h