Car tyre going flat at random intervals?

[Vapin' Joe]

On 3 occasions over the last year or so, I've woken up to find that one of the tyres on my car (the same one each time) was completely flat, the same thing also happened once when I parked up to go for a 3-hour ride, it had deflated by the time I got back.

On each occasion, I've simply pumped it up again with my track pump and it has stayed rock-hard until the next time. I've changed the valve a couple of times as a precaution, but it happened again last night.

This time, as I was pumping away, I could hear a gentle hiss of escaping air. It wasn't from the valve, and I couldn't feel any obvious draught from anywhere on the tread or sidewall. Having got the tyre up to pressure, I rolled the car back a couple of feet and the hissing stopped. Several hours later, the tyre is still fully inflated.

Could this be a sign of damage or corrosion to the wheel rim, preventing the tyre bead seating properly? With the benefit of hindsight, I should have noted the orientation of the wheel when it previously deflated, but I didn't until today.

Has anyone else experienced similar?

MTIA

Had that on a motorcycle and that is what the problem was. Dealer cleaned the rim up and problem solved.

 

[biggs682]

get it checked over as one day you could be stranded somewhere

 

[Tin Pot]

Having had a tyre pop at 70 mph on the motorway, (neither fun nor pleasant) I'd be replacing straight away.

Ditto!

Kwikfit can pop round and replace it relatively cheaply.

 

[Levo-Lon]

Kwickfit........

 

[raleighnut]

Hmmmm. At speed, the valve is forced closed by centrifugal force and the spring in effect becomes stronger.

If you push down on a Schrader valve it opens so how can centrifugal (centripetal actually) force keep it closed.

 

[Kajjal]

The other thing is you may have something a similar colour to the tyre inbedded in it or less likely the cause of the problem is no longer in the tyre. Driving round as it is, is risky and better to fit a new tyre than something alot worse happening if you can't work out the problem.

 

[twentysix by twentyfive]

Have you fallen out with one of your neighbours?

My first thought too

 

[Yellow Saddle]

If you push down on a Schrader valve it opens so how can centrifugal (centripetal actually) force keep it closed.

Oops, that was what I call a spatially dyslexic moment. Sorry @meta.

 

[DaveReading]

Have you fallen out with one of your neighbours?

I think I'd have noticed if they'd followed me all the way from Reading to Guildford just so they could let the same tyre down in the station car park there.

 

[Levo-Lon]

I think I'd have noticed if they'd followed me all the way from Reading to Guildford just so they could let the same tyre down in the station car park there.

But do you check the boot And under the blanket on the back seats??..