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Old 05-09-12 | 10:03 PM
  #13  
FBinNY
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Joined: Apr 2009
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From: New Rochelle, NY

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Originally Posted by exeo
..... I noticed there is a nut at the base of my presta valves, what are they for and are they suppose to be in a certain position?
The nut at the base of the valve is simply a convenience, and isn't critical. It helps by keeping the valve from getting pushed into the rim when you're pressing on the pump head. Some people use them, some don't.

I don't use them on my tubular tires for safety reasons, but I use them on my 1.9" tires on the commuter because otherwise I could push the valve all the way in when pressing on my pump's head.
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