Abstract: A valve for tubeless tires is of the type having elements which are radially flexible so that the elements can be deformed upon passage through a valve hole provided in a rim but which are axially rigid so as to hold the mounted valve on the rim. These elements are designed in such a manner that they cannot pass through the valve hole from the outside of the rim towards the inside under the effect of even the strongest forces. For this purpose, the lower part of these elements has, for example, a greater curvature than the curvature of the valve body.