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Tube Problems(6 posts)

Tube ProblemsWild Bill
May 17, 2001 7:08 AM
Has anyone out there had this problem? My tube gets a hole at the valve stem rim side!!! The hole is about 1/8 - 1/4 of an inch from the stem on the rim side!I only get a few flats per year but they always seem to be in this spot.
Does anyone know what causes this and how to prevent it?
There is nothing wrong with the rim or the tire.
I have used every kind of tube on the market.
I have Vector Pro's and Sestriere and both rims have Vredesten Tri-Comp tires.
The LBS will not give me credit on the tubes, saying there is something in my rim! HELP!!!!
re: Tube ProblemsSpoke Wrench
May 17, 2001 7:20 AM
Those little nuts that thread onto the valve stem, how tight do you tighten them? If you tighten them too much, they won't allow the tube to flex with the tire when you make hard turns and the result is a hole in the tube about where you indicated.

The only purpose of those nuts is to hold the valve stem out until you can get your pump locked onto it. One of the mechanics I've worked with referred to them as "The work of the devil." I just throw them away on my own bikes. On customer bikes, I leave them loose bacause that's easier than explaining why they don't really need them.
re: Tube ProblemsSpiderman
May 17, 2001 8:28 AM
also make sure when you are installing a new tube you seed that area properly by pushing in the the valve stem a little, and then pulling it back out. This will remove any twists or any wrinkles before you fill it with air.
re: Tube ProblemsMiklos
May 17, 2001 9:28 AM
I have had that problem before, but I traced mine to being caused by inflating with a frame or mini pump that has the valve built into the end of the pump. I you dont properly support the pump end and wheel exactly equal while pumping, you can stress the valve stem enough to cause leaks in the area that you indicate. My solution was the Topeak Road Morph pump that has a short length of hose so no pumping stress is transferred to the valve stem, it works just like a floor pump. This may not be you cause, but it is something else to consider.

Miklos
re: Tube ProblemsDinosaur
May 17, 2001 9:30 AM
In addition to the above suggestions, be careful when your are pumping up your tires using a floor pump. I use long stem valve tubes for my Rolf Vector Comp's and I was having the same problem. I reach down and grab ahold of the stem before I disengage the presta head on the pump. Before I had the habit of just yanking it off (I have a snap-on valve head attachment). Or consider changing your valve head to a brass chuck.
I also use a second layer of velox tape around the valve hole. I also have a problem trying to get up to max psi using my frame pump when I flatten on the road. I had better luck with a mini pump, I think the full length offers too much leverage. I've had good luck using Michelin A-1 Airstop tubes.
Good luck....(I learned the floor pump tip on this forum).
round nut placed inside of rim???skinner
May 17, 2001 9:48 AM
I once saw someone in this forum write that they put the little round nut on the valve stem INSIDE the rim. The thought was that this would prevent stess on the tube/stem connection and the nut would prevent the stem from being pulled on too much from pumps. Anybody ever heard of this?