A pneumatic radial tire or bias carcass

The invention relates to a tire comprising at least one carcass ply (2) connected to two beads (3) by two sidewalls (4), said carcass ply (2) being located radially inside a carcass reinforcement (5 ), said carcass reinforcement (5) is located radially inside a tread (6), said tread (6) having a total axial width L and an outer surface (6a), and at least a sidewall (4) having a protrusion. The protuberance is characterized in that it is included in an area enclosed by the following elements: - the axially outer wall (4a) of the sidewall (4) to a X1X2 axis parallel to the axis XX 'passing through the center revolution of the two beads, - an axis AA ', - a first arc of circle arch 1 of a first circle C1, - a second circular arc Arc2 of a second circle C2, - a X1X2 axial axis, and - a line D1.