Rim for a bicycle wheel and bicycle wheel comprising such a rim

A bicycle wheel comprising a rim, the rim comprising a body with a substantially annular extension having a radially outer portion shaped for coupling with a tire, said radially outer portion comprising an annular bottom wall provided with a depressed inflation valve area that includes a hole for an inflation valve, said annular bottom wall comprising a central annular recess and two side annular portions arranged on axially opposite sides with respect to said central annular recess, said recess comprising, at least on one side thereof closest to the radially outer portion shaped for coupling with the tire, and at least in an area circumferentially distal from said hole, with reference to a cross section of the rim, a radially inner connecting surface and a radially outer side surface with respect to said center of said rim, wherein said radially outer side surface comprises a convex curved surface, and said radially inner connecting surface comprises a concave curved surface having at least one bending radius, said radially inner connecting surface and said radially outer side surface connect at a common tangent point, and said radially outer side surface has a greater bending radius than a bending radius of said radially inner connecting surface, wherein said annular bottom wall in said depressed inflation valve area has a shape that is different from that of said annular bottom wall which is circumferentially distal from said depressed inflation valve area.