I read about valves that have removable cores and that is better for applying sealant. How can I tell if my valves have cores that are removable? (I don't have the type of the tube, or any other info; used bike).

1 Answer 1


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.

  • 2
    Most on sale aren't removable.
    – Batman
    Apr 30, 2016 at 4:40

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.