The vittoria ultralite inner tube features presta valve tubes that are most commonly used for road wheels 700c and on a few mtb wheels as the valves are thin features vittoria road inner tube 700 x 1923mm presta 42mm or 51mm suitable for 19 23mm tyres durable lightweight construction built for road performance weighs just 95g manufacturer claimed two valve sizes available presta 42mm or 51mm ideal for racing and sportives inner tube etrto weight g v