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5

It is a commonly used quick and dirty fix when you don't have a purpose-built grommet to install in a rim cut for a Schrader valve. It may also not be a terrible idea if, for whatever reason, your Presta-hole rim has a burr or sharp edge and you want to avoid any possibility of problems with that.


3

No, there is no reason for that type of installation unless the whole in the rim is sized for a Schrader valve, rather than a presta valve. It is, as you found, unlikely to cause an issue though.


5

Have a close look. On a presta valve there is a wide threaded part that the lock ring attaches to. And a narrower part with the valve lock nut above it that the cap threads onto. If the narrow part has two flat sides to get a tool onto, then it's removable.



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