Tire crown reinforcement made up of two working crown layers

摘要

The invention relates to a heavy-duty type tire, intended to be mounted on a 15 ° drop center type hollow rim. According to the invention, only the two working crown layers are present to constitute the crown reinforcement over at least 40% of the width of the tread, the absolute value of the difference between the absolute values of the angles α2 and α1 being greater than 4 °, α2 being greater than α1 in absolute value, the average angle α satisfying the relation 20 + 164 * exp (-L / 100) α 23 + 164 * exp (-L / 100) , and the reinforcing elements of the carcass reinforcement being non-wrapped cables exhibiting in the so-called permeability test a flow rate of less than 20 cm3 / min, a rubber mixture being present within the cables. Figure for the abstract: Fig 1