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May 21, 2014 at 5:17 comment added Jahaziel Almost all modern bike pumps have some sort of check valve to avoid back pressure, and many have dual purpose heads for presta/schrader use.
Jul 25, 2013 at 0:59 comment added geoffc @BillyNair We are agreed. Car tire style (Schrader) need something to depress the valve. The thinner racing tire style (Presta) use air pressure to depress it on each pump.
Jun 1, 2012 at 7:16 comment added BillyNair I have read this a few places and I am not sure why people are saying that you need air pressure to depress a Schrader valve. There might be some pumps that do this, but all the pumps I have ever owned use a small rod to push the core down, absolutely independent of air pressure.
Sep 20, 2010 at 2:55 comment added D'Arcy Norman @neilfein I use presta, and picked up a valve adapter for under a buck. keep it in my panier in case I need to use gas station pumps (or other non-presta pumps). works great. weighs maybe a gram.
Aug 26, 2010 at 20:27 history edited geoffc CC BY-SA 2.5
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Aug 26, 2010 at 13:54 comment added Dan McClain @neilfein: If you have presta valves, you should definitely carry an adapter so that you can use normal pumps. If not, you aren't properly equipped!
Aug 25, 2010 at 22:40 comment added Goodbye Stack Exchange I would add that Schrader valves are better where it's important that you be able to use a gas station pump.
Aug 25, 2010 at 20:37 vote accept Johan Dahlin
Aug 25, 2010 at 20:21 history answered geoffc CC BY-SA 2.5