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-   -   Back inner tube keeps deflating (http://www.bikeforums.net/general-cycling-discussion/889825-back-inner-tube-keeps-deflating.html)

relnix 05-15-13 08:22 AM

Back inner tube keeps deflating
 
My back tube would always deflate overnight soI went to the LBS to see what's going on but they couldn't find a reason. They thought there was just a pinch in a tube therefore changed it. I have changed 3 tubes already but this problem still persists. Anyone got an idea why this is happening?

john_steed_uk 05-15-13 08:25 AM

In my experience, it means that you probably have a sharp object stuck in your tire somewhere.

Try with a new tire and see what happens. The LBS probably didn't look hard enough.

Wilfred Laurier 05-15-13 12:55 PM

either a sharp object in the tire or a problem with the rim tape that is allowing sharp bits of the rim or spoke nipples to make tiny holes in the tubes

my experience has been that mysterious hard-to-find flats are almost always caused by the rim tape

ThermionicScott 05-15-13 01:25 PM

Quote:

Originally Posted by relnix (Post 15627785)
My back tube would always deflate overnight soI went to the LBS to see what's going on but they couldn't find a reason. They thought there was just a pinch in a tube therefore changed it. I have changed 3 tubes already but this problem still persists. Anyone got an idea why this is happening?

The thing to do is take one of these leaky tubes, inflate it outside of the tire, and dunk it in a sink or bathtub. Then you can use the air bubbles to find out where the air is leaking from and trace it to the spot on the tire or rim.

Jim Kukula 05-15-13 03:45 PM

Yeah to get bubbles with a slow leak you will probably want to blow the inner tube up quite scary huge like 5 inch diameter.

relnix 05-15-13 05:40 PM

thanks for the replies.
I took it to the LBS again and he found a staple in the tire. Hopefully the tube does not deflate again tomorrow because I will rage if I have to spend money again for tubes.

Wilfred Laurier 05-15-13 06:11 PM

yes
spending money for tubes is foolish
when you can spend money for a patch kit

Velo Dog 05-15-13 07:56 PM

I don't think anybody mentioned diagnosis here, so lemme give you a short set of guidelines:
1. Always mount the tire with its label next to the valve. That way when you have a flat, and you find the hole in the tube, you'll know where to look in the tire for the offending object.
2. While the tire is off the rim, examine it carefully for the sharp thing. Run your fingers or a rag all the way around the inside feeling for a snag.
3. Note where the puncture is in the tube. If you have holes consistently on the rim side of the tube (the side away from the road), check the rim tape and look for protruding spokes. Be meticulous. It takes VERY little to puncture a tube under high pressure. If you have holes near each other time after time, look in that area of the tire, which you'll be able to do because you followed Rule No. 1.
THERE IS NO REASON TO THROW AWAY A PATCHED TUBE. THERE IS NO REASON TO TAKE A FLAT TIRE TO A BIKE SHOP. The patches are stronger than the original tube. I've had hundreds of flats in 40+ years of cycling, and I can remember only one patch failure, when Slime leaked out of the hole and kept my glue from sticking.
Oh, and self-adhesive patches are useless. get the old-fashioned kind with a scraper and rubber cement.


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