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  • Pros don't use them - hence neither should mere mortals.

    Velominati rule 60 if you're interested in that sort of thing - personally I'm not. http://www.velominati.com/the-rules/

    In fairness, they don't do anything. My wife seemed to think I had to keep them on her bike 'because they keep the air in'.

  • They don't perform any function other than ensuring the valve doesn't damage the tube/tub during packing and transport.

    Once installed on your bike, when you're topping up tyres, you just let a blast of air out to clear the valve of dust/dirt or if you've got a puncture you're usually changing the whole thing anyway.

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