Complete Tyre Pressure Loss?

[ScottR]

Hi guys, commuting home I had my rear drivers side tyre suffer what I thought was a blow out.
Complete pressure loss after going over a speed bump that resulted in what sounded and felt like alloy and concrete meeting each other, a few yards further down the road I then heard the dreaded rubber slapping against the road. Now, the odd thing is i have inflated the tyre in an attempt to understand the point of failure but it is somehow holding pressure and seems fine? Any ideas how compete pressure loss could occur if the integrity of the tyre is still intact? Just debating whether or not to spend £450 on 4 new tyres if there could be some reasonable explanation for it?
Ta, Scott.

[Pbondar]

Hi guys, commuting home I had my rear drivers side tyre suffer what I thought was a blow out.
Complete pressure loss after going over a speed bump that resulted in what sounded and felt like alloy and concrete meeting each other, a few yards further down the road I then heard the dreaded rubber slapping against the road. Now, the odd thing is i have inflated the tyre in an attempt to understand the point of failure but it is somehow holding pressure and seems fine? Any ideas how compete pressure loss could occur if the integrity of the tyre is still intact? Just debating whether or not to spend £450 on 4 new tyres if there could be some reasonable explanation for it?
Ta, Scott.

Its not inconceivable that the tyre momentarily separated from the wheel under compression and deflated (old fashioned bead breakers did exactly that) ..with the load of it it could be re-inflated..either way, IMHO, if you had that event you'll need a new tyre come what may as you may not see any structural damage without taking it off, and even then you may not see damage below the surface..the wheel may be damaged /out of true/dented/cracked..

To paraphrase Clint "do you feel lucky punk?"

Even if you do would your pax feel the same way about it-;)

[ScottR]

Hmm, that's kind of where my thoughts were tbh just seemed a rather odd event. Agree that it needs looking at, as for pax, the reason I bought the zed is to never have any Well, at least I'm not at the mercy of a mobile fitter which i thought i would be, i can get her to the garage for a once over! If I need new wheels and tyres on a £3k zed that has already given me numerous issues in 9 months I'm going to have to start questioning where the well of money ends Would be devastating to end up in a 'sensible' car *shudders*.
Thanks for the feedback!

[MrPT]

You can lose all of the pressure from a leaking valve stem, although I’m not sure how that could be triggered by a speed bump (and deflate so quickly). Worth a quick fairy liquid test around the valve anyway.

[greg81]

I lost pressure in my e85 a few years back. Went from normal pressure to about 12psi in the space of a mile.

Managed to get to a filling station, filled it with air and it never leaked again. Very bizarre.

I took it to my local tyre place for a check over and they found absolutely nothing wrong. Tyre, wheel and valve were all perfectly fine.

[ScottR]

Hmm, I have had a similar sounding issue on my front passenger side, lost pressure on a short drive, re-inflated, went down over a two/three week period, is now holding pressure and has done for a couple of months. Im wondering whether it's more major corrosion/kerbing issues on the alloys (pre my ownership)?! Perhaps I'll get looking for another set of 107's

[Mr Tidy]

I had a very similar experience about a month ago in my 3 Series.

TPWS light came on so I checked all the tyres and one had only 1.6 Bar instead of 2.2. I pumped it up, reset the Warning System and checked that tyre every day and it hasn't lost pressure since. Weird!

I doubt the rim is damaged - although it is on run-flats they are only 17s, but I'll have a good look when I put the winters on.

[Smartbear]

How fast were you traveling when you hit the speed bump?
Rob

[Andrew Sheldon]

Sometimes a nail or whatever can cause a bad leak initially then embed itself and bung up its own hole/leak..... if you see what I mean...double check for nails...

[ScottR]

How fast were you traveling when you hit the speed bump?
Rob

Less than 5 mph as otherwise I'll scrape the front