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Floor Pump for Schraeder valves(6 posts)

Floor Pump for Schraeder valvesAztecs
Oct 8, 2002 5:20 AM
I use a Silca Floor pump for my bike which has presta valves. Would like to buy a floor pump for my friend for Christmas. He has Schraeder valves on his MTB. When I use my Silca on his tires, a lot of air seeps out when unscrewing the pump. I thought I read that some of the newer pumps had fixed this problem? Any recommendations?

Thanks
re: Floor Pump for Schraeder valvesGMS
Oct 8, 2002 5:27 AM
I went to buy a pump and my LBS asked me if I used Schraeders at all or not. He said if I did, get the Specialized pump, and if I didn't, get the Silca (because it does a notoriously poor job on schraders).

I got the Specialized primarily because it was in stock, but it does a fine job on prestas and I think it's fine on shraeders, too, though I don't use them that much. The Specialized pump inflates quite fast, goes to 160 on the gauge, has the gauge on top, and most or all of its parts are replaceable.
re: Floor Pump for Schraeder valvesdivve
Oct 8, 2002 5:29 AM
I've been using the WrenchForce Air Daddy for a year now. It's compatible with with shraeder and presta type valves. The pressure gauge is really accurate and pumping very efficient.
re: Floor Pump for Schraeder valvesSpoke Wrench
Oct 8, 2002 5:43 AM
A Presta valve uses just air pressure to push open the little poppet valve that holds the air in the inner tube. Consequently as long as the pressure inside the inner tube is greater than at the pump hose, the valve is closed.

A Schraeder valve pump has a little finger that pushes open the valve as long as the pump is connected to the valve. The more time that you take to remove the pump from the valve on the inner tube, the more air leaks out until you get that little finger out of the way and let the valve close completely.

Many older pumps used to have an air chamber on the pump that would hold high pressure air against the valve until the pump was completely disconnected. Most of the newer Schrader pump chucks that I have seen use a lever to clamp the chuck against the valve stem. This allows you to disconnect the pump more quickly and consequently lose less air pressure.
Blackburn TP-4 handles both valve types with aplomb. (nm)RhodyRider
Oct 8, 2002 6:43 AM
re: Floor Pump for Schraeder valvesthe other Tim
Oct 8, 2002 12:59 PM
Great gift idea. I think the Topeak (Joe Blow, Twister) floor pumps are nuke-proof, and they work well on both types of valves.