Tire With A Directional Tread Comprising Curved Blocks With Incisions

A tire comprising a directional tread, said tread comprising two edges and a centre, said tread comprising a plurality of blocks, each said block extending continuously along an overall curvature C from one of the edges towards the centre of said tread, forming a block central end, each said block having a width WB and a length LB, said width increasing from the block central end in the direction of the edge, all or some of the blocks of the tread comprising a median sipe of length S, said median sipe extending along a curvature C′ substantially identical to the curvature C of the block, wherein the length S of the median sipe is determined such that 0.5·LB≦S≦0.8·B, and wherein all or some of the blocks of the tread comprise a lateral sipe that is arranged in continuation of the median sipe and is decoupled from said median sipe.