Things You'll Need:
- Bike Shorts
- Bike Helmets
- Bike Pumps
- Bike Tire Inner Tubes
- Bikes
- Bikes
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Step 1
Start with the pump in Presta valve mode. Presta valves are the skinnier of the two valve types.
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Step 2
Unscrew the top cap of the nozzle.
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Step 3
Tap the pump gently so that a flexible rubber tube and a hard plastic tube come out of the nozzle.
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Step 4
Flip the plastic piece upside-down so that the pointed end faces out of the nozzle. Then slide this piece back into the nozzle opening.
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Step 5
Flip the rubber piece so that the end with the larger donut hole faces up, and slide it into the nozzle on top of the plastic piece.
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Step 6
Screw the top cap back on and pump up a Schrader valve.











