The Continental 650b/27.5" Light Presta Mountain Bike Inner Tube is great for racing and training alike. It will fit tyres from 1.75" wide to 2.5" wide and with being thinner the standard tube, this light tube gives you better rolling resistance and rotational weight. The 42mm Presta valve gives you more valve to get the pump.
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Most manufacturers can supply tubes in bulk boxes to bike shops, usually at discounted prices. Due to the volume of inner tubes we sell, we usually buy tubes in bulk boxes; so that we can pass on these savings to our customers. So if your order contains unboxed tubes rest assured they are of the same quality as regular boxed ones. The only way in which they differ from a boxed product is exactly that, no box!