Thread: What Size is a Presta Valve Hole?
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Old 12-09-24 | 12:00 PM
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JohnDThompson
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Originally Posted by OLDYELLR
Use a paper punch.
That's what I'd do.

N.B. presta valve stems are 6mm in diameter, so a hole a little larger than that is all you need. Standard (American) looseleaf paper holes are 1/4", and a perfect size (1/4"= 6.35mm).
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