When the cylinder is compressed, air is pushed down the tube of the pump and then into the tire via the valve, which is forced open by the pressure of the air. Many modern pumps use a very similar method, while some, such as the electric pumps, use an automated pumping mechanism. This would have forced the air out of the cylinder and then sucked in new air when the metal rod was pulled up again. The first bicycle pump consisted of a metal cylinder that had a metal rod running down the middle of it. It is not known when the first bicycle pump was invented, but it is believed to have been in or around 1887, which is when the first inflatable tire or pneumatic tire was produced by John Boyd Dunlop of Scotland. Inflating tubeless tires requires an initial surge of air to seat the bead, and specialized pumps are available specifically for this task. Others may not cut off, but deliver a high rate of flow to fill the larger car tire, with a risk of over inflating and bursting a bicycle tire unless it is stopped with split-second timing. Some such pumps are designed to cut off before a suitable pressure (much higher for a bicycle than a car tire), and will much under inflate the tire. Most floor pumps, also commonly called track pumps, have a built-in pressure gauge to indicate tire pressure.Įlectrically-operated pumps intended to inflate car tires (as available in most service stations) can in principle be used to inflate a bicycle tire if the right type of connection is available. During down-stroke, the piston then displaces air from the pump into the bicycle tire. During up-stroke, this piston draws air through a one-way valve into the pump from outside. In its most basic form, a bicycle pump functions via a hand-operated piston. A third type of valve called the Dunlop (or Woods) valve exists, but tubes with these valves can be filled using a Presta pump.

It has a connection or adapter for use with one or both of the two most common types of valves used on bicycles, Schrader or Presta. Outdoor public air compressor for bicycles.Ī bicycle pump is a type of positive-displacement air pump specifically designed for inflating bicycle tires.

Wrench force mini pump