Tyre Pressure Loss Question?

[Hendry]

Went out in the car earlier and it felt a bit wandery like something wasnt right, checked tyres and found the NSF was down to 17PSI, rears 32PSI, OSF was 38PSI.

 

Obviously I immediately assumed i must have a puncture but i couldnt find any puncture or any screws, nails, glass, metal shards or anything in the tyre, i havent rattled it over any potholes or anything at all and the tyre is a brand new Yokohama only fitted about a month ago, if that.

 

Then I remembered on Sunday night i went to the kebab shop, parallel parked in a space (badly) with my steering wheel full lock to the right, i reverse back and felt resistance which turned out to be the edge of the NSF wheel touching the kerb, but like sort of pressed into the kerb but not the sidewall, the actual tread because the wheels were full lock, id obviously been reversing back on full lock to the right to straighten up, got too close to the kerb, the tread has met the kerb and ive kept reversing back until i felt the resistance, so the tyre was visibly flexed against the kerb when i got out, as i was only going to be 5/10 mins getting my order i didnt move the car.

 

Would the tyre being pressed up against a kerb to the point it has flexed the rubber for a 10 minute period be enough to cause air to escape? because I can find no other tyre or wheel issue that would cause this, the old tyre on that wheel never lost any air, the wheel isnt damaged, and the new tyre was holding air fine until that point, it hadnt lost any between being fitted and last week, so around 3 weeks, i know this because i checked the pressures last week too. If what ive done has caused the air to escape, fine dont need to worry, if that wouldnt have caused that amount of pressure loss, then theres obviously some issue that isnt straight forward because theres no tyre or wheel damage or any foreign objects penetrating the tyre tread.

 

 

[spartacus]

Pump it up, check the pressure in a couple of days. If it's gone down again then take the wheel off and put it in a big container full of water to try and locate the leak. If you can't see it then it's very likely a porous alloy.

[Snipes]

Parking against a curb is more likely to deform the tyre than push air out. As said, check in a couple of days and if it's fine don't worry about it. If it drops again take it to a tyre shop and get it checked properly.

[Split_Pin]

2 out of my 4 cars have wonky tyre pressures with no obvious signs of a breach/ puncture.

 

If that's the case with you it will either be a leaky valve or the tyre not sealing against the rim.

 

I bought a double valve draper footpump and just lived with it. Better than prattling about at tyre garages chasing a leak that you might not cure.

[Mr A Lawrence]

Old alloys or rusty steels can lose pressure through the bead where the lacquer peels.

 

A tyre house should be able to sort it.

[lisbon_road]

I'd get it looked at.  Tyre pressure is so important for safety and economy, and if you don't know what is causing it, it could get worse.  The putting it in a bath of water to learn what is wrong is a good call to start if you are short of money.  Many tyre centres will do this sort of thing cheaply when they are quiet for cash, perhaps leave it with them if you can, but be warned that if it goes through the books and they are busy, the cost of tyre off - fix summat - tyre on - balance can be really daft.

[406V6]

When this happened to me recently it was caused by a nail in the tyre that I couldn't see from the outside but was obviously visible when the tyre was off the wheel. This was all fixed by a local tyre place for ~£22.

[DodgyBastard]

When faced with a tyre which is losing air I usually remove it from the rim and give it a hard wire brush. If it is particularly pitted I paint it. I always change the valves too.

 

Sent from my F5321 using Tapatalk

[Hendry]

I very much doubt theres an issue with the alloy itself because like I said there was no loss of pressure in the tyre before, either this or the one that this one replaced, im not short of money and have no issue taking it to a tyre place, I was more curious than anything else, and also a bit miffed that if it was a puncture why did it have to be the 80quid brand new Yokohama, why couldnt it if anything have been one of the old worn tyres.

 

I did have an issue with the OSR wheel losing pressure, was living with the Mrs at the time in East Kilbride and had no idea of any decent places to use as I wasnt too streetwise about the place so went into National who took 20quid for taking the tyre off the rim, filing the inside perimeter of the rim, putting some sort of coating on it and refitting the tyre, new valve and balance, id have no issue doing that again, the tyre fitter said something about some sort of coating on the rim when the wheels are new to prevent air loss but over time and tyre changes it wears away, no idea if he was talking crap but it was a cheap fix so im happy with that.

[gm]

Give it a spray with soapy water ?

 

[Junkman]

The Beastestate has SPL at the NSF.

Hence I took it to a tyre service today, which is the only possible way to find out whether anything, and if yes, what is wrong.

There are still a few questions remaining that simply cannot conclusively be answered via the internet.

What causes PL of a tyre is one of them.

[Junkman]

Fixed. The neck of the valve was bent. Cost a tenner.

[Split_Pin]

My Megane had SPL (© Junkman) on the OSF which, as noted earlier, was a nail right on the inside shoulder of the tyre, so could be that.

[oldcars]

I have 25% less of a problem than you having a Reliant

[Junkman]

I have 250% more of a problem than you having a Reliant

 

EFA

[DodgyBastard]

Surely with all your threads about tyres you'll be an expert by now...

 

Sent from my F5321 using Tapatalk

[twosmoke300]

Gripping thread !

[lovejoy]

Ha, that's nuttin', I had TPL on my NSF HA, took it to QF,

they said " RNRS", that'll BTPP,

BT JMAN ! 

[Junkman]

On the M6 I had a sudden PL on the NSR of a RR, which led to FTP.

Since I CBA I SOSed the RAC.

 

DIBI?

[oldcars]

When i was little our caravan got a puncture, it had a stommil tyre on it. Chap flagged us down and said "one has lost ones rim embellisher back there" Remember asking dad what it was, he said hubcap, go and collect it 

[Hendry]

Well i put it to 35PSI from 17PSI on Thursday, last night it had gone down to 31PSI so definitely an issue, so went to the garage this afternoon, the same garage who had supplied and fitted the tyre 3 weeks previously, guy couldnt see any punctures so dunked it in their "bath" and the valve was bubbling away, reckoned a faulty valve core so they stuck a new one in for free, love a freebie repair!! Boy said even if I hadnt just bought the tyre from them a couple of weeks ago they would still have replaced it FOC anyway because its so cheap its hardly worth charging and is more likely to get them customers when they do need new tyres if they are decent enough about daft stuff like this.

 

They also a couple of weeks ago balanced my OSF tyre FOC as well, so cant really complain, any Glasgow-ish based shiters, Farmer Autocare Neilston Road Paisley, would recommend.