A tire includes a tread rubber layer, a conductive layer located beneath the tread rubber layer and a reinforcement layer located at side periphery of the tread rubber layer and the conductive layer. Tread grooves are defined in a top surface of the tread tuber layer and a protection protrusion extends along each top edge of the tread grooves and protrudes beyond the top surface of the tread rubber layer. The conductive layer has at least one discharge terminal which is connected to an inner periphery of the tread groove. The at leas tone discharge terminal is exposed after the protection protrusions are worn out.