An inflation valve having a tubular core surrounded with an elastically deformable sleeve with a bulb widening toward the internal longitudinal end of the valve and bearing a sealing groove on its outer contour, the groove being adapted for receiving an edge of the orifice of the rim in its interior. There is a cavity between the bulb and the tubular core, having an oval-shaped outer periphery and a first spacing taken in a first direction radial to the tubular core that is greater than a second spacing taken in a second direction perpendicular to the first direction, a cross section of the inflation valve taken at the position of the cavity exhibiting symmetry with respect to the first and second directions.