Slow puncture

[Tigerobe]

Hi guys

Got a slow puncture, psi drops to 25 before the TPM alerts me. I have taken it to a few different tyre shops including kwikfit and ats but none of them can find a fault. Had valves changed too. Any ideas what it could be?


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[black_sheep]

Alloy rim damaged, so that seal between tyre and rim damaged?

Alloy wheel has a hairline crack?

Alloy wheel is porous?

Did they replace the whole valve, or just the valve core?

 

[ZK_FR150]

I'm surprised Kwik fit didn't try and make you buy a medium rated tyre at an exterionate price.

When they checked for a leak was the whole wheel put in a wheel bath or was water just poured over the wheel to look for a leak.

As black sheep has said above if the tyre is actually fine then might be a problem with the wheel, either not sealing at the rim or some minute damage where air is escaping from.

Swap your tyres over from the opposite wheel and see if it still does it, at least you will know if it's the tyre or the wheel.

 

[Tigerobe]

Alloy rim damaged, so that seal between tyre and rim damaged?

Alloy wheel has a hairline crack?

Alloy wheel is porous?

Did they replace the whole valve, or just the valve core?

The alloys are fine, there’s no marks or scratches and the rim is fine on both sides However I am not sure about any cracks.
The whole valve was replaced.
How can I check for cracks?


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[Tigerobe]

I'm surprised Kwik fit didn't try and make you buy a medium rated tyre at an exterionate price.

When they checked for a leak was the whole wheel put in a wheel bath or was water just poured over the wheel to look for a leak.

As black sheep has said above if the tyre is actually fine then might be a problem with the wheel, either not sealing at the rim or some minute damage where air is escaping from.

Swap your tyres over from the opposite wheel and see if it still does it, at least you will know if it's the tyre or the wheel.

I might try your idea. Thanks


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[Legojon]

The alloys are fine, there’s no marks or scratches and the rim is fine on both sides However I am not sure about any cracks.
The whole valve was replaced.
How can I check for cracks?

Stick it in a paddling pool of water and wait for an air bubble. I bought 4 brand new alloys and kept getting 1 tyre go flat. On the third visit to the tyre shop (that sold me the alloys) they put the whole wheel in and turns out there was a microscopic hole in the alloy. It was replaced as a manufacturing fault.