The wheel (1) comprises a rim (2) and a hub (3) between which a plurality of spokes (4) are connected. The rim has a radially recessed, cylindrical outer surface (2a-2d) with a channel-shaped cross-section and is provided with a plurality of drilled seats (6) each intended for the attachment of a respective nipple (5) for the connection of a spoke (4). Annular sealing members (13) are provided between each nipple (5) and the corresponding drilled seat (6) of the rim (2).The wheel (1) further comprises a circumferential, band-like seal (14) which is made of resilient material, is fitted on the rim (2), and extends over the recessed cylindrical surface of the rim (2) in a circumferentially stretched condition so as sealingly to cover all of the drilled seats (6).