If you've ever walked into a bike shop to buy an inner tube, the first question you'll be asked, aside from 'which size?', will be 'Presta or Schrader valve'? If this question has left you feeling ...

I know it’s borderline sacrilege around these parts, but I have a few technical problems with Presta valves. Although it seems illogical, keeping bike tires inflated consistently is the last giant ...