Valve device for a tubeless tire

A wheel rim device includes a rim (10) having a bridge (13) extending between two side walls (11), and a valve device (3) having a stem (30) engaged with the bridge (13) and having a seal (40) attached to the stem (30) for anchoring the stem (30) to the bridge (13) of the rim (10) and for making an air tight seal between the stem (30) and the rim (10), and the seal (40) includes a casing (41) engaged onto the stem (30) and engaged between the stem (30) and the bridge (13) for making an air tight seal between the stem (30) and the rim (10). The casing (41) is engaged onto a head (31) of the stem (30) for engaging with the bridge (13).