Possible tyre problem.

[Andy in Sig]

Before I set off on my Sunday ride I pumped up the tyres to their prescribed 7 Bar. After a few minutes I felt a bumping from the back wheel. I had a look and thought that the tyre was bulging out to the side in one place. So I let a bit of air out and the bumping lessened. I had to repeat the process a couple of times.

My questions are:

a. Is a bulging tyre wall likely to cause bumping?

b. Does a bulging tyre wall mean that part of the tyre is failing? I'm pretty sure that it can't be down to the inner tube.

c. It also occurred to me last night that the wheel could be going out of true, not laterally but across the diameter. I've not had time to check that yet though.

Any thoughts?

 

[jimboalee]

Inflate the tyre to recommended pressure.
Inspect it for bulges.

If bulging anywhere, throw it away.

 

[HeartAttack]

What make of tyre? There is a known problem with some of the Ultremo R tyres that do this, the manufacturers are doing free replacements but that doesn't help when you are miles from home.

 

[swee'pea99]

Try deflating the tyre completely, then using your hands to loosen it all round the rim and make sure it's evenly 'distributed' (they can get stuck, which can cause probs, in my experience), then re-inflate to the recommended max. If after that there's anything not pukka, it's a chucker.

(You need to be sure about c. tho')