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01/11/2019 at 5:24pm
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A few months ago when I checked the tyre pressures on my car which is parked on the road outside my house, one rear tyre was about 5 pounds under-inflated. Thinking I had a slow puncture I pumped it up and checked it over the next few days and I have had no further problems with it since, so I assumed I must have accidentally under-inflated it the last time I checked them.
However, a couple of days ago I checked my tyres and this time the front tyre on the same side of the car was about 9 pounds under-inflated. I pumped it up and it has not lost any air since.
Between these incidents I purchased a new decent tyre pressure gauge so it is not a faulty gauge causing the problem.
Does anyone know if tyres can suddenly lose air for no reason or is some local toe-rag deliberately letting air out of my tyres at night? The dust caps were still on the valves so it is a bit of a mystery.
I check my tyres regularly when cold so it is not normal deflation through lack of maintenance and all the other tyres are fine.
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01/11/2019 at 5:39pm
Location: Aberdeen
Outfit: Peugeot 407 SE & Relum Palermo 6
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As an ex tyre fitter I would say that the probable cause would be striking the kerb, causing a slight leak from the "bead" ( where the tyre meets the rim) Or someone may be playing silly Bu**ers!
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Ally
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01/11/2019 at 9:24pm
Location: Lichfield
Outfit: Coachman Amara 450
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It could be a minute bit of dirt that you can't see with the naked eye that accesed the valve from the last time you attached the inflator hose. Because the seal is less than a 100% it will cause air pressure to escape over a few days or weeks depending how much debris is restricting the seal. The next time the inflator hose is attached is will most likely blast away the existing particles and create a perfect seal. I had this on my rear near side tyre about two years ago and the mobile fitter explained the above which made sense and eliminate the mystery of a slow deflation as my car is locked up in a garage every night so ruled out any deliberate act.
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01/11/2019 at 10:50pm
Location: Isle of Mull
Outfit: 2 x Outwells Kairos 400 Caranex
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Bob61, something I'm quite used to and I've come to the same conclusions. I've had this happen several times, either after having checked tyre pressures on a very dusty rally or having to (gently) climb up kerbs to let oncoming traffic through on our very narrow access road. Potholes can do it too - at least ours do!
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01/11/2019 at 10:52pm
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Thank you Tango, that sounds a possibility too. I think it has to be either the kerbing or the valve (or both). I hadn't thought that scraping the kerb could release some air but obviously it can and I do recall touching the kerb quite hard a few days beforehand, which is a relief because I thought somebody was messing with my car - lol.
Unfortunately the kerb outside my house is quite high and on a slight curve. I try to park as close as possible because it is a narrow road and occasionally get too close.
Thank you also, Ficklejade. I feel that could be the answer and has put my mind at rest. I will try to keep a little further away from the kerb in future - lol.
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02/11/2019 at 10:00am
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Apart from losing air, the 'kerbing' won't be doing your sidewalls any good.(your alloys even less, if you have them.) If i have to go up the kerb, i try going up at least 45 degrees or more, so it is the tread thats in contact with the kerb itself. As opposed to the tyre wall scraping up it.
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02/11/2019 at 10:56am
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Quote: Originally posted by Mick S. on 02/11/2019
Apart from losing air, the 'kerbing' won't be doing your sidewalls any good.(your alloys even less, if you have them.) If i have to go up the kerb, i try going up at least 45 degrees or more, so it is the tread thats in contact with the kerb itself. As opposed to the tyre wall scraping up it.
I usually park next to the kerb not up it - lol - but occasionally misjudge the distance, normally when I am in a hurry. You are quite right, scraping the kerb won't do the tyres much good and the scratches on my alloys don't look good. However, hitting the kerb is not something I do every day but just on rare occasions, which is why it didn't occur to me that was possibly the reason for my pressure loss.
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03/11/2019 at 7:53pm
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Just an update...checked tyres again today and pressures are all perfect so I am now convinced that scraping the kerb was the culprit. Today I parked a good 6" away - lol.
Thanks to all for the advice.
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Topic: Any Tyre Experts?
