Optimized Architecture of a Tire of the Heavy Duty or Civil Engineering Type

A radial tire for a heavy-duty or civil engineering vehicle comprising

• a crown reinforcement, radially inside a tread and radially outside a carcass reinforcement,
• a median plane (M) perpendicular to the axis of rotation of the tire and passing through the middle of the tread,
• the crown reinforcement comprising a working reinforcement,
• the working reinforcement comprising at least two working layers, each comprising metal reinforcing elements coated in an elastomeric material that are parallel to each other, forming an angle at least equal to 15° and at most equal to 45° with the circumferential direction (XX′), said metal reinforcing elements being crossed from one working layer to the next,
• the crown reinforcement comprising a hoop reinforcement comprising at least one hooping layer, each hooping layer comprising metal reinforcing elements coated in an elastomeric material, parallel to each other and comprising two axial ends on either side of the median plane (M),
• the reinforcing elements of each hooping layer forming, at the two axial ends thereof, angles (Ae1, Ae2) of the same orientation and having absolute values at most equal to 10° with the circumferential direction,
• wherein the angle formed by the metal reinforcing elements of a hooping layer with the circumferential direction (XX′) is variable from one axial end of said hooping layer to the other axial end, and has a maximum absolute value (Am) at an axial distance from the median plane (M) at most equal to 15% of the axial width of said hooping layer, and
• wherein the maximum absolute value (Am) of said angle is at least equal to the mean of the absolute values of the angles (Ae1, Ae2) formed by the metal reinforcing elements of said hooping layer with the circumferential direction (XX′) at the two axial ends of said hooping layer plus 10°.