Tire tread for a farm tractor

A tire for a vehicle for agricultural use, comprising:

• a tread comprising a plurality of bars,
• at least one of said plurality of bars extending radially outwards from a base surface of the tread over a bar height (H), axially towards the inside from an axial end of the tread and circumferentially, in a preferred direction of rotation of the tire, between a leading face and a trailing face,
• a bar comprising, in any axial plane (Pxy) parallel to the axis of rotation of the tire, a leading profile, the intersection of the leading face and of the axial plane (Pxy), and a trailing profile, the intersection of the trailing face and of the axial plane (Pxy),
• wherein the angle (A) of the straight line (T) tangential to the leading profile at a point (M) on the leading profile, with respect to an equatorial plane (P) of the tire passing through the middle of the tread, increases continuously from an axially outermost point (E) of the leading profile, when the axial distance (L) between the point (M) of the leading profile and the axially outermost point (E) of the leading profile increases, in that the angle (A) reaches a maximum value (Am) at a point of inflection (I) of the leading profile, and in that the radius of curvature (R) at any point (M) on the leading profile, positioned axially between the axially outermost point (E) and the point of inflection (I), is at least equal to 0.4 times the height (H) of the bar.