Pneumatic vehicle tire

A pneumatic vehicle tire is provided to prevent a decoupling groove from being damaged by preventing small stones and impurities from being into the decoupling groove. A pneumatic vehicle tire comprises a tread(1), a sidewall(2), a bead section(3) and an additional rib(4) formed in a decoupling groove(5). The height(h) of the additional rib(4) is lower than the height(H) of a main rib at two ends of the tread(1). The additional rib(4) has a hook shape provided with a stud protruding inwardly. The decoupling groove(5) has a narrow inlet and a wide bottom section(51). The height(h) of the additional rib(4) corresponds to 20% to 50% of the height(H) of the main rib. The bottom section(51) of the decoupling groove(5) has a circular section.