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[batt45]

Hey. Have one alloy which will not stay inflated. About a week to go from 30psi to 10psi. New tyre and valve alloys seem fine,
     Seem to remember an auto trader programme on sky saying that there is a rememdy that can be pumped in via the valve to stop this. Is this right???   

[feeutfo]

Have they checked for corrosion on the rim bead? It prevents the tyre from seating correctly and leaks.

Usually remove tyre, wire brush the rim, paint sticky black sealant around the bead and re fit the tyre.

[feeutfo]

Or the rim is cracked. ....?

[Stallion]

Or the rim is cracked. ....?

good point, worth a thorough check to see if your alloy has one. And there is something called tyre weld which stops punctures!! 

[cem_devecioglu]

immerse in water so you will be sure where its leaking from..

[Martian]

As per chrisgixer's post, I'd also be blaming the corrosion on the edge of the rim.
I certainly wouldn't put tyre weld in it, unless you want balancing problems among other things.

[feeutfo]

Tyre weld is an emergency get you home product only, and I right pita to clear out when the real problem needs fixing which it will do anyway. Plus the wheel balance issues as said. It's not an every day product or we would all have it.

This is a common issue though to varying dergrees. The time is never taken to clean the rim by fitters as they are up against it on time and hence cost. So it's rare ime for pressures to stay constant. But for me the proof of it came when I bought a second hand set of wheels and had time to clean the bits of sleared rubber and corrosion off the rim before fitting tyres, the rim was covered. They now hold pressure far better than any other wheels on any car I've owned previously.

I still check them once a week though, where they loose about 1psi a week evenly over each wheel. Other wheels have been all over the place after a short time.

Also her polo had similar slow leak on two wheels, and cleaning the beed sorted it. If you buy tyre weld kern it for emergencies only, as designed. 

[feeutfo]

Should add some fitters charge extra for tyre weld affected wheels.

[TheBoy]

Could be valve as well. Esp if the last scummers to change the tyre never bothered to replace valve.

Dunking in a big bucket is the only way to tell where it leaks from

[Vamps]

Tyre weld is an emergency get you home product only, and I right pita to clear out when the real problem needs fixing which it will do anyway. Plus the wheel balance issues as said. It's not an every day product or we would all have it.

This is a common issue though to varying dergrees. The time is never taken to clean the rim by fitters as they are up against it on time and hence cost. So it's rare ime for pressures to stay constant. But for me the proof of it came when I bought a second hand set of wheels and had time to clean the bits of sleared rubber and corrosion off the rim before fitting tyres, the rim was covered. They now hold pressure far better than any other wheels on any car I've owned previously.

I still check them once a week though, where they loose about 1psi a week evenly over each wheel. Other wheels have been all over the place after a short time.

Also her polo had similar slow leak on two wheels, and cleaning the beed sorted it. If you buy tyre weld kern it for emergencies only, as designed. 

As fitted to Citroen C4 Grand Picasso, along with a compressor, all in place of a spare wheel.......

[Kevin Wood]

.. But a Citroen is only an emergency get you home product too.