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Inside the pump that attaches to the stem is a micro bolt with a vertical line. When you attach the pump and pull the lever up to lock the pump to the stem, that little bolt turns and locks the stem to the pump. Most often I have been in such a hurry that I jam the pump to the stem and pull the lever, not locking the stem, and of course after 60 psi or so it ...


For shorter stem presta valves in deep rims the trick to fill air is to first deflate the tyre about 50%, then push the pump head onto the stem with one hand while at the same time pushing the stem through the rim from the tyre side with your other hand. Then use the lever to get a good seal. When you pump it up, the increase in pressure in the head of the ...

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