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    Got this new bike and not sure how the wheels work like how they're pumped.

    It's basically one hollow screw that comes out of the wheel and then a second kinda smaller one that has a little bit of rubber on it which slots into the first one.

    I can pump the tyres up fully when it is just the hollow screw but when I the pump of all the air comes out within seconds.

    Anyone heard of this sort of pump or know what Im supposed to do?

    Got this bike off eBay
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    http://www.bing.com/images/search?q=...fo0&ajaxhist=0

    do you mean the 'presta valve' in this image?

    if so, at the top of the valve there is a small ring which you screw down as far as you can, then you can attach your pump
    you also need to make sure your pump is compatible with presta valves
 
 
 
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