Suspension system for vehicle and tire for vehicle

A road-going assembly comprising a vehicle comprising a front axle and a rear axle, and of a set of tires which are mounted on their mounting rim in order to be fitted to the front axle and the rear axle of this vehicle, each tire of this vehicle comprising a crown region extended laterally by sidewalls which connect to beads intended to be in contact with a mounting wheel, each tire comprising a carcass reinforcement running from one bead to another bead via the sidewalls and the crown of the tire, the crown region comprising a reinforcement surmounted radially on the outside by a tread, this tread comprising, radially on the outside, a tread surface intended to come into contact with the road surface when the vehicle is running, a plurality of grooves being formed in the thickness of the tread, wherein:

• the depths of the grooves of the treads of the tires fitted to the rear axle are at least equal to 3 mm and at most equal to 5 mm,
• the depths of the grooves of the treads of the tires fitted to the front axle are at least equal to 5 mm, the depths of the grooves of the treads of the front axle being greater than the depths of the grooves of the treads of the rear axle, and
• at least in the case of the rear axle, the static setups comprising camber and toe-in are close to zero, such that a camber of each wheel-tire assembly on said axle of between −0.8 degrees and +0.8 degrees and a toe-in at the wheel of between −0.15 degrees and +0.15 degrees, wherein the static setups of the rear wheel-tire assemblies are equal in terms of absolute value and symmetric with respect to a plane perpendicular to the road surface,
• the grooved area of the treads of the tires of the rear axle have a level that is at most equal to 24% and is less than a level of grooved area of the treads of the tire of the front axle, this level of grooved area being equal to the ratio of the surface area of sunken regions to the total surface area of the tread.