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Sat 28 Jul 2007 21:21

Porous alloys ? - adverse camber

It has been suggested that the reason one of my tyres has started going down is that the alloy has become porous and that I should have it refurbed or buy new ones.

This sounds like rubbish to me. I think its more likely that the weight they fitted is disturbing the seal of the tyre against the rim. I fail to see how a 'refurb' would alter the properties of the metal even if there were porosity (which I don't believe)

Am I being over cynical?

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Sat 28 Jul 2007 21:23

porous alloys ? - Armitage Shanks {p}

I had 2 porous alloys on a Golf which were wrong from new. One tyre went flat and the other went to about 20 psi - both replaced under warranty. It can occur and and it doesn't follow that it is anything you or a tyre fitter have done.

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Sat 28 Jul 2007 21:26

porous alloys ? - George Porge

Removing the tyre and painting the well of the wheel cures the problem.

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Sat 28 Jul 2007 21:40

porous alloys ? - mal

It is not the actual alloy metal being porous, the deflation is is caused by corrosion on the areas of contact between the rim and the tyre.

As for the balance weights, I always insist on stick on weights but make sure the fitter cleans the the rim well before sticking them down.

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Sat 28 Jul 2007 22:25

porous alloys ? - Cliff Pope

Quote from the Dunlop tyres website:
"Cast alloy wheels should be treated to ensure they are not porous".

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Sat 28 Jul 2007 22:28

porous alloys ? - adverse camber

>>It is not the actual alloy metal being porous, the deflation is is caused by corrosion on the areas of contact between the rim and the tyre.

Thanks Mal - That makes sense.

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Sat 28 Jul 2007 23:14

porous alloys ? - Pugugly {P}

Anyone remember the Austin Allegro Equipe - four flat tyres every morning !

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Sat 28 Jul 2007 23:28

porous alloys ? - Civic8

>>Anyone remember the Austin Allegro Equipe

Erm yes,I wrote one off,tyre went flat in the wet on a steep bend and a lamp post jumped into my front

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