1. A tire for a heavy goods vehicle, havinga radial carcass reinforcement comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements that are crossed from one layer to another, forming angles of between 10° and 45° with the circumferential direction,
said crown reinforcement itself being capped radially with a tread, said tread being joined to two beads by way of two sidewalls,
the radial carcass reinforcement additionally comprises, in each shoulder, an axially outer end of a layer of additional reinforcing elements that are mutually parallel in the layer and are oriented circumferentially,
wherein said axially outer end of said layer of reinforcing elements that are mutually parallel in the layer and are oriented circumferentially is axially outside said at least two working crown layers, and
at least one additional protective layer is axially interposed between the layers of additional reinforcing elements, an axially inner end of each respective additional reinforcing layer that are mutually parallel in the layer and are oriented circumferentially being axially in line with an axially outer end of the at least one additional protective layer, of reinforcing elements
wherein the reinforcing elements of the carcass reinforcement have a diameter less than 0.85 mm, and wherein said reinforcing elements of the carcass reinforcement are made up of threads with a diameter less than 0.16 mm, and
wherein the crown reinforcement, which is supplemented radially on the outside by the at least one additional layer, the reinforcing elements being oriented with respect to the circumferential direction at an angle of between 10° and 45° and in the same direction as the angle formed by the inextensible elements of the working layer which is radially adjacent thereto.