My bianchi has them but when I got a snakebite I replaced one for a spare tube a threaded valve because that's all I had. IMO they are the same as normal tubes, just quicker to change in the event of a p'ture.
Coming to think about I asked Wiggle if they done any tubes with a threadless stem and they never had a clue.
Never seem them i suppose onced pumped up they will be the same, i bought 10 in one go so not had need to buy any but i will out for them because i dont like the nut it marks your rim
i've got 5 vittoria ultralite 51mm sitting right here. they work fine, i use them mainly because one of the bikes has deepish section rims (can't use the track pump with short valves), so i may as well just use the one sort.
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