KANGERDUN Football/Basketball/Volleyball/Bicycle Air Pump - Black 4-Piece Set

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A bicycle pump is a positive displacement air pump designed to inflate bicycle tires. It comes with a port or adapter that works with one or both of the two most common valves found on bicycles: Schrader or Presta valve. There is also a third valve, called the Dunlop valve (or Woods valve), but inner tubes fitted with this valve can be inflated with a Presta pump.
Bicycle pumps are designed to help people perform activities that promote good health and a healthy lifestyle. They guarantee good fitness results whether used indoors or outdoors, with or without the supervision of a fitness trainer. They are also recommended for professional and non-professional athletes.

Bicycle pumps compress air. When the cylinder is compressed, the air is pushed into the inner tube of the pump and then into the tire through the valve, which is forced open by the air pressure. When the handle is pulled up again, the valve automatically closes, preventing the tire from leaking, and new air is pressed back into the cylinder, repeating the process. Some pumps come with a pressure gauge that shows the air pressure that is being pushed into the tire. Once the tire is at the correct pressure, the valve can be removed from the tire and the valve cap replaced on the valve.

How it works

Bike pumps work with two main types of valves: Presta and Schrader. Some pumps are compatible with both, others are not, but there are adapters available that allow pumps to work with any type of valve. The "All Valve Adjustable Connection System" (also known as AVACS) allows the pump to work with any type of valve on a bicycle, and also with other common inflation products such as balls, paddling pools, and rubber rings. The AVACS feature is usually available on a variety of pump models, and can also be purchased as a separate valve attachment. It also works by repeatedly pushing and pulling the piston.