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3 flats while inflating???

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3 flats while inflating???

Old 02-04-06, 04:02 PM
  #1  
COWBOYCRAMER
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3 flats while inflating???

Hey I've got a a problem. I've had my bike on the trainer for the winter, a few days ago I was doing homework (and not riding the bike) when all the sudden the rear tube blew (like a pinch flat) while the bike was just sitting. I examined the tube and the hole was right next to the valve, maybe a quarter inch away, on the rim side of the tube. After replacing the tube I was inflating my tires to do an outside ride, when my front tube did the same. While replacing the front tube, the new rear tube did it again. All of the holes happened in that same spot. The only constant was tube selection. I ride Xero wheels and hutchinson tires. Air pressure was filled to 120 p.s.i. using a (yikes) compressor. Any ideas on what caused the three consecutive blowouts? (I did not even ride the bike between these three occurences).


thanks!!!
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Old 02-04-06, 04:09 PM
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Wild. The only suggestion I can make is check the valve holes, maybe there is a burr of metal at the drilling or something. Good luck.
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Old 02-04-06, 06:39 PM
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maybe the gauge is off on your air compressor and you're putting in more air than you think. other than that... i have no idea
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Old 02-04-06, 06:41 PM
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Is your rim tape in good condition? If it doesn't already have velox you should put some on there, that stuff lasts.
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Old 02-04-06, 06:44 PM
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Tube holes right next to the valve stem often indicate poor inflation technique. Is the stem wobbling around when you inflate the tube?
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Old 02-04-06, 06:44 PM
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Originally Posted by endform
Is your rim tape in good condition? If it doesn't already have velox you should put some on there, that stuff lasts.
+1

I had some rim tape with a burr on it that caused three flats. LBS couldn't really see anything wrong with it but we changed it out anyways because the other tire had had the same problem(but was obvious). No more flats since.
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Old 02-04-06, 07:17 PM
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Run your finger through the inside of the tire, maybe there is a piece of metal, glass, or a rock stuck in the tire.
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Old 02-04-06, 08:16 PM
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Alot of the times you will get your flat near the valve. It is the weakest part of the tire. Also, over inflating if not careful with a compressor. The same thing happened to friends of mine on a group ride we did a while back. Same area, around the valve.
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Old 02-04-06, 10:32 PM
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I wrap gaffer tape around the base of the valve stems -- has never failed me
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Old 02-05-06, 02:45 AM
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I agree with all of the above suggestions, in particular (1) burrs on the valve hole and (2) poor inflation technique. However, the latter is usually a problem when inflating after fixing a puncture while on the road.

BUT, I do have a solution for the problem that really works. Cut a one-inch segment of a ruined tube. Then cut it open and cut it again so that you have a piece that's about 1" x 0.75". With an awl or the point of a scissors, puncture the piece of tube at its center. Push the valve of your tube into the and pull the piece of tube down the valve stem (it should be snug) until it stops. It will provide protection against burrs on the valve hole and any wobbling during inflation. It works. I had the problem you had and now I don't.
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Old 02-05-06, 04:28 AM
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After mounting the tyre, make sure you push up the valve-stem all the way into the tyre to make sure that no piece of the tube is stuck between teh tyre and rim. Pump it up to 1psi so that it holds shape, then pull the tyre away from the rim and look at the gap between the tyre and rim. You should not see any tube poking out. Work your way around the entire rim looking at the gap. Then switch to the other side of the rim and inspect the gap all around. Once and only once you've confirmed that the entire tube is fully seated inside the tyre, then you pump up to full pressure.
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Old 02-05-06, 12:27 PM
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Agree with post #10. Cheap insurance and makes old tubes 'recyclable' . . .
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Old 02-05-06, 10:46 PM
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i would guess burrs, or one time i had that happen, i tightened the little nut on the valve stem too tight.
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