Abstract: The tire of the invention incorporates an active nylon flipper in each bead region. The flipper is active in the sense that it actively absorbs differential shearing strains that arise between each turnup end of the ply and each rigid metal bead during heavy-duty service. In conjunction with each of the two flippers, a chipper protects the portion of the ply lying closest to the wheel rim when the tire is mounted. A nylon patch overlaps the respective end of each chipper, the turnup end of the ply, and the radially outermost part of each flipper. The shearing modulus of the nylon material of each flippers and each patch is intermediate between the shearing moduli of the adjacent materials, which thus distributes and absorbs shearing stresses in ways that reduce the tendency of the turnup ends and the radial most part of the chippers to separate from the adjacent tire structures during heavy-duty operation.

Abstract: A radial medium radial truck (RMT) tire has belt or breaker plies which are reinforced by organic reinforcement cords or filaments. In the preferred embodiment, organic multifilaments are used in the top belt or breaker plies which have the following characteristics: at least a gauge of 420×2 dTex to about 3300×3 dTex, a tenacity of about 35 cN/Tex to about 200 cN/Tex, an initial modulus of at least 30 g/denier (250 cN/Tex) and a shrinkage of about 0.1-10 %. When an organic polymer reinforcement is used in the top belt or breaker in the belt package of a tire, scrapping of tires during a retreading operation because of corrosion is greatly reduced. In addition, acceptance for retreadability is increased because of reduced top belt or breaker damage, allowing for easier preparation for the retreading. Moreover, the invention relates to an improved construction to reduce defects known as blows.