Tire with composite ply structure and envelope turnup

摘要

A tire (10) and method of building a tire is described wherein the tire has a carcass assembly having a pair of sidewall plies (17a, 17b) and a bridge ply (50), each ply being reinforced with cords, the sidewall plies each having a first end (20a) which is received between the bridge ply (50) and a belt reinforcing structure (24); wherein each sidewall ply (17a, 17b) extends axially outward along the sidewall and extends radially inwardly to the bead core (26) and is folded from a position axially outside the bead core (26) to a position axially inside and around the bead core to an axially inner turnup end; said bridge ply (50) having ends (50a, 50b) which overlap with a respective inner turnup end of said sidewall ply.