PURPOSE: To reinforce compression resistance of an outer cord and secure the high degree safety factor by increasing the inter-layer cord gap on the external surface of a shoulder section in a bias-ply tire which is used in aircraft etc.

CONSTITUTION: A carcass 2 is formed in bias structure in which 10 or more rubber plies of a organic fiber cord are laminated and forms a framework of a troidal barrel shell C including a tire tread 1. In this case, the inter-layer cord gap of the organic fiber cord is configured so as to gradually increase toward the outside from the interior of the troidal barrel shell C in a shoulder section which ranges from 0.1W0.6 times the height H of the tire, being measured from the bead base of the tire. The average dimensions of the said gap are assigned to the 0.8W3.5 times value of the cord diameter.