Tire for off-road vehicle having improved endurance

A tire for an off-road vehicle, comprising:

• a crown part extended on each side by sidewalls, these sidewalls ending in beads,
• a carcass reinforcement extending in the crown part, the sidewalls and the beads,
• the crown part comprising:
• a crown reinforcement situated radially on the carcass reinforcement, the crown reinforcement comprising:
• at least one working reinforcement, and
• one protective reinforcement, and
• a tread radially on an outside of the crown reinforcement and having a width W and a thickness E of wearable material, this thickness E of wearable material being at least equal to 50 mm, this tread comprising:
• a superposition of at least two layers of materials, a first layer located radially on an inside and a second layer located radially on an outside of the first layer to come into contact with ground when the tire is new, this second layer having a thickness E2 comprised between 20% and 90% of the thickness E of wearable material,
• at least two narrow grooves defined in the tread running circumferentially all around the tire the at least two narrow grooves being fluidically separate from each other, and axially spaced apart from each other, wherein each groove is formed by two walls that are axially spaced apart from one another and each wall extends circumferentially uninterrupted all around the tire, wherein:
• the narrow grooves have a zigzagging overall shape of wavelength L and amplitude A, the wavelength L being between 10% and 120% of the axial width W of the tread, and the amplitude A being between 10% and 75% of the axial width W, and
• the material of the first layer of the tread is chosen to have low hysteresis;
• wherein the measured tan(δ) value of the material of the first layer is at most equal to 0.30.