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You'll have to start with determining which kind of valve you've got. For the US there are basically two options:

  1. Schraeder valve, the same as on a car
  2. Presta valve, which is narrower.

Then find a pump with the appropriate nozzle. For Schraeder, just remove the cap and go at it. Particulary if you're filling from a compressor, don't exceed the max allowable pressure stated on the tire sidewall.

For Presta, remove the cap, undo the locknut, give the valve a push to break the seal. Then apply the nozzle and inflate the tube.

For Europeans there's the added option of the Dunlop valve, which can be inflated with the same type nozzle as the Presta, but there's no locknut that needs to be opened.

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Q: How does pneumatic bicycle pump work?
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