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[Diamond Black Geezer]

Recently managed to upgrade to brand new tyres fitted all round. (sourced independantly so can't go back to anyone complaining about faulty tyres)

Noticed the other day 'ah that front looks a bit low.' it was, down to under 20psi. Back up to 34. Next week, down again, did it again. Keep on top of it, I think, and investigate when I can, suspecting a bad schrader valve.

Parking up in my dinnerhour wanting to be tight to the kerb, as I tried to get in very tight heard a PFFFFT!!! Ok..ermm.... To find that basically my tyre has had the bead broken by being pushed against the kerb. As luck would have it I was opposite the body shop where I'm having some work done soon, I pinched some air and headed back to work.

I'm assuming that the alloy has some form of deformation or corrosion that's causing a bad bead? I've never seen the bead broken in this way, only after car accidents where they've mounted pavements at high speed/smashed alloys.

What the hell's happened? 

[GastronomicKleptomaniac]

Buckled wheel? Are there loads of weights opposite?

[Nick W]

Nothing weird about it; you break the bead by applying a large force in a small area. You did that with the cars motion and the kerb, to a tyre with low pressure.

[henryd]

Nothing weird about it; you break the bead by applying a large force in a small area. You did that with the cars motion and the kerb, to a tyre with low pressure.

Yep,power steering and a kerb edge make a very effective bead breaker especially if tyre was soft to start with.

[Ratboy]

Actually its not so uncommon. Could be a bend rim, hairline crack in your rim,Old valve or shrader valve. Could be corrosion that should not have been there if the fitter would care for its job. I'm a tyrefitter for almost 20yrs fitting tyres from a 4" rim to 50" minetruck tyres. We get leaking wheels every day and about 25% of them are cases as mentioned here. The aluminium alloys these days are crap. They mostly get corrosion problems within 2yrs of age. On or runflat low profile tyres cracks(inalmost all cases the inside) are a common thing. Even with premium brand oem brand rims.
Due to alot of people thinking they can drive like with balloon tyres. A lil hint. When changing tyres. Be it new or puttting wintertyres. Always ask to clean the beadsurface of the rim and new valves,and stay away from those stupid aluminium valvecaps. They are crap and corrode solid to the valve itself. If you have fitted a pressure checking system with an aluminium valve like renault for example. Always keep those greased with a coat of vaseline or so or you be buying 50£ perbnew valvesystem plus the registering of it.

[Diamond Black Geezer]

Cheers all.

Yep the logic of the kerb acting as a beadsplitter is understandable.

I'll be getting back to the tyre place, get them to break the bead, then we can have a good look at the state of the rim. check for either splits or corrosion 

[Ratboy]

Cheers all.

Yep the logic of the kerb acting as a beadsplitter is understandable.

I'll be getting back to the tyre place, get them to break the bead, then we can have a good look at the state of the rim. check for either splits or corrosion 

And also ask if they want to mount the rim without the tyre on the balancing machine and look for wobbles while its turning. Then you can see if your rim is ok and how much unbalance there is in the rim alone. It should be 0 to max 2grammes

[Diamond Black Geezer]

Thanks! Max of 2gramme 

They're a decent, cheap n cheerful proper old greasy garage, where they (I assume) know what they're talking about, and will let you stand there and have a chat about cars while they're working. So I'm sure they're be happy to pop the tyre off and investigate. Luckily I have a 5th spare alloy the tyre can go on even if it is proven to be a 'bad' alloy.

So, going by all the replies, it's looking like it's not the tyre then?

I have, by the way, checked for nails etc !

[Ratboy]

if all is checked and fixed you should be just fine. if they have it you could ask to apply some beadsealer but if your rims are cleaned you should be fine.
what sometimes  can happen doh its a rare problem is that the tire starts losing air only when driving but when there is no force applied its sealed.
mainly the problem is either a bad or chipped bead or your rims are so far corroded the size has come below minimal tolerance.
if the issue still persists, you can try squirting some washingup liquid on the seam where tyre and rim meet on in and outside. and just leave it for a good 30mins.
if you dont see any bubbles your fine