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Old 07-12-08, 11:56 PM   #1
bell9440
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valve stem ?

I am a total nube when it comes to bikes.I bought a Rossin bike (for $25 bucks)and it has mavic ma40 (I think 24")rims.I have never seen valve stems like these.how do I air up the tires?
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Old 07-13-08, 12:01 AM   #2
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I take it that you have presta valves?


You just need a pump specific to presto that's all. Go to your local bike store or try craigslist.
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Old 07-13-08, 12:02 AM   #3
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http://en.wikipedia.org/wiki/Presta_valve
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Old 07-13-08, 12:02 AM   #4
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ok after a little searching I think they are presta valves.can someone give me some info on what I need to know about these.thank you
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Old 07-13-08, 12:05 AM   #5
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Welcome. I think you have a presta valve. Since you are new, you might want to get to know
Sheldon Brown's site. It's full of pretty much anything you need to know about bikes.

http://sheldonbrown.com/gloss_p.html#presta

http://sheldonbrown.com/beginners/index.html
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Old 07-13-08, 12:07 AM   #6
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ok after a little searching I think they are presta valves.can someone give me some info on what I need to know about these.thank you
http://en.wikipedia.org/wiki/Presta_valve
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Old 07-13-08, 12:24 AM   #7
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thanks guys.this is my first bike so its all greek to me lol
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Old 07-13-08, 12:33 AM   #8
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thanks guys.this is my first bike so its all greek to me lol
Actually, you'll find that some of it is French, some English, some Italian and some American...but all of it is fun.

Enjoy your air-filled tires.
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Old 03-31-09, 05:32 PM   #9
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My question is a bit different. Can 700 cc tubes be had with Schrader type valves?
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Old 03-31-09, 05:33 PM   #10
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My question is a bit different. Can 700 cc tubes be had with Schrader type valves?
Yes. Your LBS should have them.
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Old 03-31-09, 05:53 PM   #11
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Yes. Your LBS should have them.
They probably won't fit through the holes in your rims though.....
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Old 03-31-09, 06:00 PM   #12
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They probably won't fit through the holes in your rims though.....
You can make presta holes bigger with a drill. BE CAREFUL!
Or, you can use a hand reamer. Which is what I used when I last did that a long time ago. Why would you not want to use presta tubes? I use presta tubes in schrader holes. with little adapters)
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Old 03-31-09, 06:08 PM   #13
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You can make presta holes bigger with a drill. BE CAREFUL!
Or, you can use a hand reamer. Which is what I used when I last did that a long time ago. Why would you not want to use presta tubes? I use presta tubes in schrader holes. with little adapters)
+1 Presta are far superior.
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Old 03-31-09, 06:23 PM   #14
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+1 Presta are far superior.
Here we go! Please explain. In what ways are they "far superior"?
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Old 03-31-09, 06:36 PM   #15
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Here we go! Please explain. In what ways are they "far superior"?
To me the biggest advantage is that the hole in the rim is smaller in diameter. With narrow road rims that makes for a stronger rim.

Easier to pump up as no spring depressor needed in the pump chuck and less air is lost while attaching and removing the pump chuck in my experience.

Available in multiple stem lengths for use with various depth rims, including deep V ones. I have not seen bike tubes with Schrader valves in multiple lengths.

If properly tightened after filling less likely to have a slow leak at the valve assembly, a problem I have seen with Schrader valves.
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Old 03-31-09, 06:59 PM   #16
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Quote:
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To me the biggest advantage is that the hole in the rim is smaller in diameter. With narrow road rims that makes for a stronger rim.

Easier to pump up as no spring depressor needed in the pump chuck and less air is lost while attaching and removing the pump chuck in my experience.

Available in multiple stem lengths for use with various depth rims, including deep V ones. I have not seen bike tubes with Schrader valves in multiple lengths.

If properly tightened after filling less likely to have a slow leak at the valve assembly, a problem I have seen with Schrader valves.
I'll give you the smaller hole in the rim and different lengths offered.

Easier to fill with a pump is bogus. What makes you think that most of the air you hear isn't coming from the hose just as it does when you remove the chuck from a Presta tire. Using a compressor I'm positive that I can inflate at least 2 or 3 schrader valve tires in the time it takes to inflate 1 presta valve tire..

Retaining pressure is bogus. Your air conditioner uses 200 psi line pressure and is expected not to leak at all. Everyone that I've ever seen uses a Schrader valve.

In the interest of full disclosure, all of the bikes that my wife and I own use Presta valves. Partly for the reasons that you mentioned and partly out of tradition and style. I don't have anything against Presta valves, I just don't think they are "far superior" to Schrader valves.
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Old 04-01-09, 03:13 AM   #17
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Quote:
Originally Posted by Retro Grouch View Post
I'll give you the smaller hole in the rim and different lengths offered.

Easier to fill with a pump is bogus. What makes you think that most of the air you hear isn't coming from the hose just as it does when you remove the chuck from a Presta tire. Using a compressor I'm positive that I can inflate at least 2 or 3 schrader valve tires in the time it takes to inflate 1 presta valve tire..

Retaining pressure is bogus. Your air conditioner uses 200 psi line pressure and is expected not to leak at all. Everyone that I've ever seen uses a Schrader valve.

In the interest of full disclosure, all of the bikes that my wife and I own use Presta valves. Partly for the reasons that you mentioned and partly out of tradition and style. I don't have anything against Presta valves, I just don't think they are "far superior" to Schrader valves.
It should be me saying "Here we go" - not you.

It is easy to put air into a presta tube than into a schrader - regardless of whether you disagree.

Pumps that use flexible adapters are just nasty.

A decent pump will put air into a presta valve or a schrader, however it's easier to do so with presta valves.

LOL @ "out of tradition" if you want to use a valve out of tradition the schrader has been around for about 120 years and presta for only 1/2 that.

The advantages of using presta valves have all been listed, those advantages make presta superior - for bicycle use - for a lot of people.

So how about not saying "Here we go" when someone else states something that is both obvious and correct ?

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