Reinforcing element having a flattened cross-section

A tire comprising at least one reinforcing element, wherein the at least one reinforcing element has a cross-section with a flattened overall shape having an aspect ratio greater than or equal to 5 and extending in a main direction and comprising at least one lateral edge made of a polymeric composition comprising a thermoplastic polymer, the at least one lateral edge extending in a general direction substantially parallel to the main direction,

• wherein, in a section plane substantially perpendicular to the main direction, the at least one reinforcing element has a central point defined as a point of intersection between a first median plane of a width of the at least one reinforcing element and a second median plane of a thickness of the at least one reinforcing element, the first and second median planes being substantially perpendicular to one another and each of the first and second median planes extending substantially parallel to the main direction,
• wherein, in the section plane substantially perpendicular to the main direction, microhardness R=(Uc−U1)/Uc>11%,
• where Uc is an average value of microhardness of the at least one reinforcing element (a) measured at the central point when the central point is made of the polymeric composition or (b) measured at a point of the polymeric composition that is radially closest to the central point when the central point is not made of the polymeric composition, and
• where U1 is an average value of microhardness of the at least one reinforcing element measured at a measuring point of the polymeric composition belonging to the second median plane, the measuring point being distant from an end point belonging to the second median plane and from an external lateral surface delimiting the at least one lateral edge by a distance in a range of 0 μm to 50 μm, and
• wherein the at least one lateral edge does not have any ridges.