spare tube valve length
04-27-16, 06:51 AM
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spare tube valve length
Newbie question here. I'm looking to get a spare tube. Size is 700x40c Schrader. So I get that any schrader tube that the 40c falls within (say 35-43c) will fit. But I see another set of numbers, some 32, 40, or 48mm. That's the valve length? And does that matter?
04-27-16, 07:00 AM
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You need the valve to extend through the rim far enough for the pump head to engage properly. Other than a few grams of weight and cosmetics the only drawback to valves that are too long is to folks who use a direct fit (no hose) hand pump. The pumping action can rock the valve and the farther they extend beyond the rim, the more prone to snapping off if you're a bit ham fisted.
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Last edited by FBinNY; 04-27-16 at 07:04 AM.
04-27-16, 09:39 AM
#3
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A single wall rim can use the shortest stem.
Double wall rims need a longer stem.
The DEEP V type rims need the longest sizes.
Double wall rims need a longer stem.
The DEEP V type rims need the longest sizes.
04-27-16, 09:48 AM
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You could always measure the one you are using; presumably it is working OK for you.
04-27-16, 11:21 AM
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Should I be measuring the stem from where it sticks out of the rim, or from the top of the rim? It is a double wall rim. If measuring from where the stem is sticking out, 32mm would be fine as that's what is showing.
04-27-16, 11:24 AM
#6
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What rim do you have?
Sometimes you can Google the rim and find a recommended valve length.
1"=25.4mm
Sometimes you can Google the rim and find a recommended valve length.
1"=25.4mm
Last edited by Bill Kapaun; 04-27-16 at 11:27 AM.
04-27-16, 11:27 AM
#7
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Y'know what I hate? The dept store Schwinns with the deep rims and longer than stock schraeder valves. Who has those kinds of tubes kicking around...?
04-27-16, 11:41 AM
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If there are 32mm of valve stem exposed, you need to know how many mms are hidden inside the rim in order to buy the right tube. Pull the tube out and measure it. You only need to pull out a few inches right at the stem and then shove it back in. Not a big task.
04-27-16, 11:55 AM
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Use your X-ray vision (aka eyeball judgement) to "see" the base of the valve in the rim. If your X-ray vision isn't working, figure it to be about 8mm below the other edge of the tire flange. Place a ruler there, and measure out to where you'd like the valve to end up, or measure the existing valve, and adjust your eyeball estimate to the nearest available valve length.
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FB
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
04-27-16, 12:59 PM
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How about a photo. Rim brand and model?
I have moved to a low V shaped rim. (Velocity Aerohead,Shimano RS10). I use any length of valve I get (short?). Sometimes it is a pain to first inflate a newly installed tube, but one only needs the valve to stick out the length of a couple of threads. Perhaps even less if one uses a presta/schrader adapter.
I have moved to a low V shaped rim. (Velocity Aerohead,Shimano RS10). I use any length of valve I get (short?). Sometimes it is a pain to first inflate a newly installed tube, but one only needs the valve to stick out the length of a couple of threads. Perhaps even less if one uses a presta/schrader adapter.
04-27-16, 01:10 PM
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Zephal HPXs will start a very short valve. Once partially inflated, they often stick out far enough that a floor pump valve will work.
Just my experience; ie that short valves are a bigger hassel at home than on the road. Now, I have yet to go deeper than a Velocity Aero. That's about the limit to how deep you can go with a 32.
Ben
Just my experience; ie that short valves are a bigger hassel at home than on the road. Now, I have yet to go deeper than a Velocity Aero. That's about the limit to how deep you can go with a 32.
Ben
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