Bicycle Tire Inner Tube with Pneumatic Valve

An inner tube for a bicycle tire is provided. The inner tube includes a vessel and a valve stem. The valve stem is coupled to the vessel and a end having a fastener, the end having a first opening having a first diameter. A cap is coupled to the fastener and has a pin passage with a second diameter. The cap has a concavity on an outer diameter. A circular seal is disposed between the cap and the second end, the seal having a second hole having a third diameter that fluidly couples the first opening and the pin passage, the third diameter being smaller than the pin passage. A biasing member is disposed within the first hole. A sealing member is movably disposed within the first opening and is biased against the seal by the biasing member.