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Tube visible under bead

Old 04-29-18, 12:59 PM
  #1  
philbob57
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Tube visible under bead

I just mounted 2 tires with 2 new tubes. Each time, when I checked to make sure that the tubes were not stuck between the bead and the rim, the tube was was visible between the rim and bead for about 1/4 of the circumference of the wheel, from about 9 o'clock to noon (or noon to 3) with the valve at 6 o'clock.

Sun CR-18 rims, new Michelin Krylion 2 Endurance 700x28c tires, new Forte (performance Bike shop) tubes.

My hands are weak, especially my thumbs (which had surgery to mitigate arthritis pain). I need to use the Kool-Stop Tire Jack to get tires mounted. I pay attention to not getting the tube between the bead and the rim, but I'm not perfect by any means.

1) I tried to free the tubes by lifting the tire away from the rim repeatedly with no air in the tube. I didn't have much success with that with these 2 tubes/tires, though it's worked in the past with different tubes/tires.

What did seem to work was going through a few rounds of a) inflating the tube some, b) lifting the tire and tube away from the rim where the tube was visible, c) deflating the tube to see if the tube was still visible between bead and rim, d) repeat until the tube was no longer visible.

Are there better techniques? I think stronger hands would be the solution, but this is the only thing I need stronger hands for, so I'm not likely to keep up the necessary hand exercises....

Thanks in advance fro your help.
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Old 04-29-18, 01:14 PM
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le mans
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I had the same problem, trying to remember exactly, the inner rim was a basic design 26" wheel

yet a particular 26" tyre wouldn't fit it properly
so i chose other tyres from my huge collection of seconds untill one would play

i'd suggest taking them back to the shop, get the mechanic to take a look, wrong tyres, me thinks
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Old 04-29-18, 01:31 PM
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A few PSI in the tube should allow the tube to free itself from the bead, as you found. There is a risk of pinch flatting any tube that ends
up between the tire and the rim during install of the tire on the rim, because the tire tool will cut the tube on either the bead or the rim
edge. You might also check that your rim tape is not too wide for the rim, had that problem with one rim set, being then unaware of
different widths of rim tape and the tape overlapped into the bead area on the rim and interfered with tire bead seating.
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Old 04-29-18, 02:01 PM
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Bill Kapaun
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I almost fill the tube with air.
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Old 04-29-18, 02:47 PM
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I like to put a very little bit of air in the tube and stuff it in the tire. Then I mount one bead of the tire, slip the stem through the hole in rim and get ready for cussing or joys of every thing going right. Here you have to play around with the amount of air in the tube. Air keeps the tube rounded and for me seems to help keep it from getting caught in the bead while mounting. But air also will prevent you from getting the beads down in the channel to allow you to get that last little bit of bead over the rim. So I'm either letting air out as I go, or if schrader, loosening the valve core to allow a slow leak.

I also powder my tubes and the inside of the tires, sometimes even the tire beads. I use baby powder. Seems that even with our youngest of two children being 28 yo we have tons of baby powder left. It's use for me is a dry lube to let every slide around easily while putting it all together. I've used soap water on beads too, but the baby powder while messy doesn't get everything wet that I don't want wet.

Cancer? My tires and tubes do not have ovaries, or any other female organ that's been implicated in the cancer scare.
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Old 04-29-18, 02:57 PM
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Kept pushing the tire bead inward, until you stop seeing the tube out and under it, yet?
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Old 04-29-18, 07:16 PM
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One technique I've used is to mount and fill with only a small amount of air. Not more then then will allow the tire to be pressed on the ground and compress down against the rim. Then grabbing the axle ends do place the tire on the ground and roll the wheel a revolution or two in each direction. (Going both ways will help the valve's tendency to cock off 90* to move back to 90*). Try inflating more while checking the bead for good seating. Andy
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