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-   -   Tubeless air leakage issue (https://www.team-bhp.com/forum/tyre-alloy-wheel-section/40205-tubeless-air-leakage-issue.html)

I have Palio 1.6 Sport which is 18 months old. I have changed the stock tyres to Bridgestone Turanza (same profile) when i got the car. Everything has been well and I am really happy with the tyres. Since 2 months, I am observing that air in one of the tyre seems to be leaking. I check up the air whenever I fill petrol. Now, all the tyres usually show 28 (i always fill 30 psi). But this one tyre comes down to 24-25 psi. The maximum it falls to is 24 psi and no further. It stays on that on that figure. i had taken it thrice to tyre wala guy and he cannot find a puncture.

What should I do next?

Same thing happened to my new Turanza one of the tyre been leaking, the tyre dealer told me to replace the rim don't know he is not willing to take responsibility since I didn't have bill for the same(I tried to save the vat). I am using my old tyre instead.

I can understand the problem with the rims. But my car has alloys. I don't think alloys can bend and cause this problem.

did you checked out the valve maybe its faulty. sometimes the neck of the valve in tubeless is faulty puncture guy won't be able to find that.

"Ishan Tyrewalla" (aka Rags) advised me that this can happen with tubless tyres. Apparently small holes get created in the tyre itself and these can be repaired by your friendly neighbourhood tyre repair shop.

Pump upto 50-55PSI and then check for leaks.
Even minute leaks start showing up.
And don't worry, the tire won't burst.

Valve is usually suspect. Try replacing that.
Along with that ask tyre person to check tyre for small leak/holes. Tyrewallas apply some soapy solution on tyre to check for air bubbles. Hopefully this should sort out the issue. Also ask that person to check the tyre from inside.

Caution - 50-55 PSI might be way beyond the max. air pressure of the tyres. One should not pump air beyond the max. sustainable tyre pressure. Please check the same for your tyres and then pump.

Max rated pressure under load for most tires is around 45PSI.
I am talking about a few minutes of sustained pressure.

If there is nothing wrong with the tyre (after inspection).

Keep a lookout for trouble makers in your apartment bldg / neighborhood. Its could be kid stuff / Street urchins.

Someone might be fooling around with your mind. Might sound absurd, but its known to happen before.

cheers:

Thanks guys.

The shop that I have been visiting is a reputed one and i am their customer for 3 years now. I trust they are technically good. I thought about the valve but the guy there confirmed that it was fine. Only things left out small holes which sure looks scary.

But my question is -
Why does the pressure never goes below 24? last time, i did not fill the air for 2-3 weeks. Should I leave the car for longer time?

Here is the likely reason. You are measuring the tyre pressures at a bunk after your car has run for some time. Your alloy wheels and tyres are in hot condition. Quite possible that this one wheel is getting heated up more than the other ones for various reasons (e.g. due to braking). So even though you set the same pressures on all four tyres in hot conditon, after the tyres have cooled down, this one tyre will show less pressure. There are a lot of assumptions here, but it is true that tubeless tyre pressures are very sensitive to the temperature factor (the tube provides an extra layer of insulation and so tubed tyre pressures will not be so sensitive).

My advice: Set your tyre pressures accurately when cold (when car has not done any running) and also measure them when cold. Preferrably set them and measure them at some given time of the day (e.g. 8-00 AM). Last time I set the tyre pressures (cold) in Mumbai at 7-30 AM at 36 psi. Two weeks later I measured the cold tyre pressures in Pune at 8-00 AM with the same digital gauge. The reading on all 4 tyres was 36.5 psi. Presumably this is due the higher external temperature, there can be no other reason.

What exactly is this phenomena and how does this happen? How is this repaired and is there any way that this can be found while buying a tubeless tyre as this is slowly getting common.

I assume this happens as the tyre ages.

Hi,

> What should I do next?

Why don't you shift this tyre to another rim and see? This way you can isolate the problem to the tyre or the rim.