Repeat tube failures. I suspect my floor pump. Input before I replace it?
#26
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The clue is in the quoted text. The valve section of the tube is getting pinched between the rim and the tire beads.
After seating the second tire bead in the rim, you need to push the valve stem into the tire before inflating. This will get rid of the bulge and seat the valve section of the tube inside the tire.
After seating the second tire bead in the rim, you need to push the valve stem into the tire before inflating. This will get rid of the bulge and seat the valve section of the tube inside the tire.
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6th reply.
That's the only explanation for this IMO.
What I concluded was happening was that at the valve hole, the well was so narrow that the reinforced area around the valve prevented that part of the tube from resting in the bottom of the rim. The valve sat high, and the rest of the tube stretched down resulting in the tube bulging and stretching at the edge of the reinforcement.
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#28
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FWIW, I used my Silca Track pump for a very long time, before I realized I was pushing
the bell shaped, air chamber's gasket on too far, up the stem..
now , I put it so it grips the smooth band between the cap thread, and the ring nut thread, and all is well..
easier to remove with air pressure in the hose, & the gasket lasts a long time..
the bell shaped, air chamber's gasket on too far, up the stem..
now , I put it so it grips the smooth band between the cap thread, and the ring nut thread, and all is well..
easier to remove with air pressure in the hose, & the gasket lasts a long time..
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I wonder if the OP puts on the little valve stem thread locker before he pumps the tire up. Some people eschew the use of that little part but if you thread that little washer onto the stem before you pump you can ensure the valve stem is seated properly. I would also suggest going back to the smaller of the two tube sizes.
I would add that floor pumps that screw on the presta valve don't end up pushing down on the valve when they are attached so even if you think that little lock ring is going to cost you 3sec over 4 hours they are helpful in this sense. Not as quick, perhaps, but after too many issues with too many push-on floor pumps I got a Lyzene which does take an extra 3 seconds to screw on, and I like it very much. (and the little Lyzene frame pump is fantastic).
I would add that floor pumps that screw on the presta valve don't end up pushing down on the valve when they are attached so even if you think that little lock ring is going to cost you 3sec over 4 hours they are helpful in this sense. Not as quick, perhaps, but after too many issues with too many push-on floor pumps I got a Lyzene which does take an extra 3 seconds to screw on, and I like it very much. (and the little Lyzene frame pump is fantastic).
Last edited by digibud; 04-07-13 at 10:01 AM.
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For some reason my floor pump has a threaded schrader chuck, so I use an adapter and it works great.
Threading it on is a slight hassle, but I prefer it to the way other chucks work by a long shot.
Threading it on is a slight hassle, but I prefer it to the way other chucks work by a long shot.
__________________
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
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To reduce stress on the valve stem I remove the air chuck from my presta valve tube by grabbing the wheel at the valve with both hands and pressing evenly on the bottom of the chuck with both thumbs.
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