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Old 06-07-08, 01:17 PM   #1
kmcrawford111
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Tear at Valve Stem Base - Repairable?

Yesterday, in my haste to leave for work on time, I smacked my bike into my wife's bike behind it. All of the air came rushing out of the rear tire within a matter of seconds. Today I changed the tube, and examined the bad one. As I suspected, I must have struck the other bike with the valve stem, because the result was a tear right where the stem meets the tube. It is about 40% around the base and the stem is Shraeder.

Obviously the glueless patches I have won't fix this, but is there any way to fix this so I have at least an emergency spare tube? I was thinking perhaps with the glue from glue-on patches?

Thanks for any suggestions.
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Old 06-07-08, 01:27 PM   #2
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buy a new tube. I don't think there's any fool proof way to fix this.
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Old 06-07-08, 01:55 PM   #3
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A valve stem tear cannot be repaired.
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Old 06-07-08, 02:00 PM   #4
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Originally Posted by kmcrawford111 View Post
.. because the result was a tear right where the stem meets the tube. It is about 40% around the base and the stem is Shraeder.

... but is there any way to fix this so I have at least an emergency spare tube? .
There are a few things working against a successful patch job:

1) the damage is a rip, not a hole or puncture. The damaged area will tend to continue it's tearing path in the future.

2) the surface is irregular and hard to ensure a quality bond.

3) the joint between the stem and tube is a relatively high stress area, especially during pumping.

Basically, any repair job would be unreliable and not worth the effort. A new tube would provide peace of mind well in excess of the savings of patching the old tube.

However, don't throw that old tube away. You can cut it up and make tire boots from the tube, use it around the workshop and home if you need rubber pieces to protect items, integrate it into arts and crafts... One lady in my area actually makes wallets and purses from old bicycle tires and tubes!
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Old 06-07-08, 02:25 PM   #5
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tubes are cheap........
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Old 06-07-08, 03:10 PM   #6
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tubes are cheap........
+1

$5.00 at my shop. Cheaper at big box shops and online.
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Old 06-07-08, 03:26 PM   #7
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save a few valve bodies though..........
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Old 06-07-08, 05:34 PM   #8
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I've never managed to mend a tube with a leak at the valve stem base. Why not buy a few spare tubes and carry a new one as a spare?
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Old 06-07-08, 06:15 PM   #9
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I'd love to go against the crowd, here, but ... I can't.

Buy a new one
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Old 06-07-08, 07:41 PM   #10
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Quote:
Originally Posted by kmcrawford111 View Post
Yesterday, in my haste to leave for work on time, I smacked my bike into my wife's bike behind it. All of the air came rushing out of the rear tire within a matter of seconds. Today I changed the tube, and examined the bad one. As I suspected, I must have struck the other bike with the valve stem, because the result was a tear right where the stem meets the tube. It is about 40% around the base and the stem is Shraeder.

Obviously the glueless patches I have won't fix this, but is there any way to fix this so I have at least an emergency spare tube? I was thinking perhaps with the glue from glue-on patches?

Thanks for any suggestions.
You think you can repair it foolproofly for a labour cost of less than $3? If not, buy a new tube.
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Old 06-07-08, 10:29 PM   #11
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price point. 5 tubes for $10.00
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Old 06-07-08, 11:51 PM   #12
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save a few valve bodies though..........
For what, may I ask?

Thanks for the responses... I will buy a new tube. It isn't really about the cost - I just hate to throw something away if I can repair it.
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Old 06-09-08, 06:00 PM   #13
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A repair is possible.
You just cut the valve closely out, use another tube which has irreparable damage distant from the valve, cut out the calve with some tube attached so you have about 2.5 cm (approx. 1 inch) overlap, apply the cement , let it dry, and then press it on.
I havenít done so, I am not recommending it, price wise it costs similar as a new tube (due to the amount rubber cement needed). I think it's risky, since the tube might fail - but this would be my answer in the wilderness survival final exam, if the question came up.
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Old 06-09-08, 06:06 PM   #14
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add to my above post:
I actually would try to not patch the new valve with the overlap on, but rather insert it in the hole cut (from the old discarded valve) and therby try to glue the overlap to the inside of the tube.
PS: further costs added to the above repair is the amount of solvent needed to clean your fingers and the mess thereafter.

Last edited by saturnhr; 06-09-08 at 06:23 PM.
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Old 06-09-08, 07:43 PM   #15
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A repair is possible.
You just cut the valve closely out, use another tube which has irreparable damage distant from the valve.....

These days I'd buy a new tube. That bit I quoted is what dad did once when I was a kid...seemed to work out OK. Money was pretty tight.
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Old 06-09-08, 07:55 PM   #16
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For what, may I ask?

On occasion just the valve body will fail. You're always gonna generate bad tubes; might as well keep a few valves out of them in case one fails; that way you save 5$ on a new tube.

And if they are Schrader; they'll work on the car too............
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Old 09-06-09, 10:04 AM   #17
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repair

I tried to make a valve stem tear repair just now by using a big patch w/ an X cut into it for the valve and some rubber cement. Miserable fail. Time to buy a new tube.
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Old 09-06-09, 11:15 AM   #18
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Originally Posted by saturnhr View Post
A repair is possible.
You just cut the valve closely out, use another tube which has irreparable damage distant from the valve, cut out the calve with some tube attached so you have about 2.5 cm (approx. 1 inch) overlap, apply the cement , let it dry, and then press it on.
I havenít done so, I am not recommending it, price wise it costs similar as a new tube (due to the amount rubber cement needed). I think it's risky, since the tube might fail - but this would be my answer in the wilderness survival final exam, if the question came up.
Interesting, I was going to say that a repair is almost always possible, but how much time/money/effort/waste would it cost? I hadn't gone as far as to figure out a way to fix it. Your idea would almost certainly work. I wouldn't use it though, unless, as you say, you're stuck somewhere with a long walk home.
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Old 02-22-15, 09:34 AM   #19
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Originally Posted by saturnhr View Post
A repair is possible.
You just cut the valve closely out, use another tube which has irreparable damage distant from the valve, cut out the calve with some tube attached so you have about 2.5 cm (approx. 1 inch) overlap, apply the cement , let it dry, and then press it on.
I havenít done so, I am not recommending it, price wise it costs similar as a new tube (due to the amount rubber cement needed). I think it's risky, since the tube might fail - but this would be my answer in the wilderness survival final exam, if the question came up.
Wow!! I've tried more than a few times to patch a valve stem but always failed. This was a terrific idea your dad had. On my way out to give it a try.... I'm not cheap... Just poor...
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