Inner tune bulge - advice needed

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Inner tune bulge - advice needed

Postby robbiepapenfus » Tue May 07, 2013 6:43 pm

Hi guys,

I have a Trek Hybrid with 700 x 32 wheels.

Occasionally i have noticed that my inner join has been virtually bulging out from the inside of the tyre, always by the valve.

Describing in non-technical terms, from what i can see, it looks like the tyre bead is not fitting snug inside the rim as there is not much space between the base of the valve and the rim wall (if that make sense?).

It could be a combination of the 'not so snug fit' and perhaps im pumping my tyres too hard? Currently its around 92psi.

Any suggestions as to what I'm doing wrong?

Thanks in advance.

Regards,
Robbie
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by BNA » Tue May 07, 2013 7:10 pm

BNA
 

Re: Inner tune bulge - advice needed

Postby QuangVuong » Tue May 07, 2013 7:10 pm

THe tube hasnt been pushed into the inside of the tyre. Deflate, and push the valve in. The rubber around the valve sometimes doesnt go into the tyre, esp on skinny rims, and your issue happens. Get it sorted soon otherwise, youll get a flat real soon.

Tyre air pressure ratings are written on the sidewall.
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Re: Inner tune bulge - advice needed

Postby robbiepapenfus » Wed May 08, 2013 9:32 am

Thanks for the advice!

The tyres can go up to 95psi, so perhaps i have been pumping it up a little too hard.

I have reduced the pressure, to about 85psi, and it seems much better.
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Re: Inner tune bulge - advice needed

Postby ironhanglider » Wed May 08, 2013 10:45 am

Robbie, the pressure you used is not the problem.

You have an installation error and it is likely to cause a blowout if you don't fix it. This could be at best inconvenient, at worst dangerous. The issue is the same as the one described in this response from Mr Zinn. The components are different but the issue is the same.

Cheers,

Cameron
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