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Bulge on tyre near valve

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Bulge on tyre near valve

Old 11-19-13, 09:43 AM
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Bulge on tyre near valve

Hi again guys,

I've got a new tyre and tube on an unused rim. I pumped it up to the lowest minimum pressure, 100 psi, and now I have a bulge where the valve is.

What could be causing this?

Thanks

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Old 11-19-13, 09:46 AM
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Try reseating the tire while pushing the valve stem in gently. My guess is that you had the stem retaining nut snugged down and the tire couldn't properl seat around the tube at that spot.
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Old 11-19-13, 10:05 AM
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Classic case of poor seating, especially if you mounted the way I do, ending at the valve. This often leaves the reinforced section of the tube trapped under the tire's bead.

Deflate the tire completely, push the valve deep into the tire to pull any tube out from under, then push the tire home and pull the valve back out. Once it's all properly arranged, it's stay that way, so no need to worry about valve nuts or the like.
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Old 11-19-13, 03:36 PM
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Thanks guys, you were right about the nuts. I put then on before I inflated.

What happened was that it pulled the reinforced part of the tube around the valve below the bead, pushing the bead up from below.
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Old 11-20-13, 07:59 AM
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I generally throw the nuts away when I unwrap a tube, and prefer unthreaded valve tubes when I have the choice. They are only meant to stabilize the valve stem and should never be more than sort of snug, as they can put strain on the tube and rip the valve out of the tube.
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