If you have a Presta valve, unscrew the top nut and press in to fully deflate the tube. If you have a Schrader valve, simply press the pin in the valve to release remaining air. Step 3 ...

The Tubes have a seamless construction, with a mold-cured vulcanization, to ensure uniform roundness Size: 28" - 700x25-32mm Valve type: 42mm Presta Valve Contents: 4 Continental Inner Tubes ...

If your bike has Presta valves on its rims or tubes, you'll know that pumping the tires can be a fiddly business. The Zilch floor pump is claimed to address that problem, with head seals that don ...