Poorly fitted tyres???

[gsewell]

I've just had some new tyres fitted to my Cayman by a branch of a branch of a major tyre/exhaust shop. On driving away, I noticed a rhythmic shh, shh, shh noise followed a couple of hundred metres later by a loud pop and the rear of the car bounce for a second. By the time I found a safe place to stop, the noises had gone away so I continued home. Checking the pressures, my nearside rear had dropped 2.5psi! I am assuming that the beading was not perfectly set and that was the pop that I heard/felt.

Going for a quick test drive this morning, there was nothing of note and the tyre pressure had held steady for 2 days. Am I worrying over nothing or should I go back?

[Mark A S]

Sounds exactly like you envisage, the tyre was not fully on the bead and driving it popped it on! Bit worrying I must say.
I would go back and point it out to them, regardless of there attitude towards this, at least it might [ hopefully ] be something they will be more careful about in future.

Cheers

[psylsph]

Go straight back it will have wrecked in the inner wall of the tyre. All the rubber will have pealed off the inner face of the wall. I'd be less worried about loosing air, than the possibility of a blow out. All this is based on personal experience by the way, having had this problem the tyre fitter showed me the inside of the type the wall was wrecked and fully of rubber shavings. Go back ASAP.

[gsewell]

Back from the tyre shop and I am not entirely impressed. First reaction was that I had remounted the wheel as they claimed that they did not use white paste. However, they removed the wheel and the only evidence of anything untoward was the lack of a balance weight. The wheel needed 55g.
We could see no scuffs, scrapes or scratches on either the tyre nor on anything in the wheel arch.
Their hypothesis is that the balance weight was not secure and hence caused the shh'ing noise and then flew off while I was accelerating, causing the instability.
So do I now invalidate the tyre guarantee (yes against punctures, etc) by going elsewhere to get a second opinion?