Pneumatischer Reifen

摘要

A pneumatic radial tire has at least one carcass reinforcing ply and a pair of opposing bead portions (14). Each bead portion (14) has a bead core (22) and a bead apex (24), while the carcass reinforcing ply has a main portion (18) and two turnups (20), with one turnup extending from each end of the main portion and having a terminal end (30). In each bead portion (14), there is a minimum distance (D MIN ) between the carcass main portion (18) and the carcass turnup (20), as measured perpendicular to the tire equatorial plane (EP). The minimum distance (D MIN ) is not less than 50% of the maximum bead core width (W B ) as measured perpendicular to the equatorial plane (EP). In each bead portion (28), radially outward of the minimum distance (D MIN ), a radially outermost portion (28) of the carcass turnup (20) extends at an angle so the radially outermost portion (28) of the carcass turnup (20) is divergent from the carcass main portion (18), wherein the divergence is represented by the angle difference (Ã-±) being at least 10°.