Captain Slow wrote:What you are describing is a pinched tube, not a bulging tyre. I don't see how pinching the tube could make a tyre bulge.
If the bead seat diameter of the rim is much less than the bead diameter of the tyre then because the tyre does not necessarily take up a circular form, the non circularity appears as a bulge. When installing the tyre, you must take care not only to avoid pinching the tube, but also to ensure that the tyre is centrally seated. You do this by a light low pressure inflation. Then go round the wheel and make sure none of the tube is pinched. Inflate some more and go around again and make sure that the mould line of the tyre is evenly space aboove the top edge of the rim. When that has all been adjusted to your satisfaction, inflate to operating pressure.
Some tyres are particularly loose on the rim and will require this attention. I have a combination of Mavic rim with Vittoria tyres that give such a loose fit that I do not require tyre levers to remove or fit a tyre. But I have to be careful to avoid a pinch or a bulge. Not exactly rocket science. Closer to brain surgery though. Price of the components is not necessarily a definitive guide.
I realise this does not address the point made above in the quote. I will make reform a new years resolution.