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Bicycle pumps pump air into tires and suspension forks.

5
votes
When you use the pump to inflate a tire the pump body gets hot. This heating up results in a temporary expansion of the body itself. If the cylinder and the base are made of two different materials … (cylinder made of metal, base made of plastic) this thermal cycling can lead, in the long run, to loss of air tightness and less efficient pumping. In the worst case the pump can simply break. So I …
answered Apr 9 '18 by L.Dutch - Reinstate Monica
32
votes
What you have is basically a cylinder of rubber. When you lift the lever, the cylinder is compressed on the circular faces. This results in the sides expansion, which will "hug" the valve giving the s …
answered Sep 18 '17 by L.Dutch - Reinstate Monica