Tyre losing pressure

[sbrewster]

Recently noticed my nearside rear tyre was losing pressure - roughly 2-3 psi per day.

Thought it must be a slow puncture, so just kept topping up the pressures regularly.

Couple of weeks ago changed both rear tyres (they only had 3mm left anyway) Wasn't there when the tyres were changed (mobile tyre fitters did it at my gf's house while I was at work) so didn't bother checking the old one for nails/screws/etc.

Now the new tyre on the same wheel is losing pressure again, at about the same rate.

Can't believe I've got another puncture in the same tyre. Is it possible it's a dodgy valve?

Any advice or similar experiences gratefully received.

Simon

[LeeME3]

First off get hold of the fitter and ask if they changed the valve (they often do), then you need to think about the rim - if it has been badly kerbed on it's edge (where alloy meets rubber) they can leak there. Best bet is probably to take it to a specialist tyre and wheel refurb place and see what they reckon (should be free to get it checked).
Good luck!

[sbrewster]

Thanks for the replies,

The fitter didn't fit a new valve, it's definitely the same one as before.

Wheels haven't been kurbed (only ever park it in the garage at home, on the gf's drive or in car parks).

Don't much fancy buying a new alloy!!

Si

[sportsandclassic]

Why are people still fiting tyres without replacing valves.....??

Just test it with some soapy liquid and see if it bubbles up might be lucky and see it.

[BliarsGoing]

sportsandclassic said:

Why are people still fiting tyres without replacing valves.....??

Just test it with some soapy liquid and see if it bubbles up might be lucky and see it.

Or spit in the valve stem and see if it bubbles up.

[DucatiGary]

sportsandclassic said:

Why are people still fiting tyres without replacing valves.....??

my OPC didnt change the valves last time I used them to change the tyres.. . . . .

[sportsandclassic]

The opc i used to work at always changed the valve with the tyre...basics....takes less than a minute if just a standard valve if not then the screw in type take abit longer but should be replaced with the tyre its good practice.

[drhildr]

Try giving it a bottle of the puncture repair foam - and before anyone rolls their eyes in disgust at the thought of treating a high performance tyre so, I can tell you that, out of desperation, suffering the same problem in my Gallardo in the middle of the Spanish plains, did exactly that! Hey presto, problem fixed and no adverse effects at all, in fact I forgot I had done it and ran the car for another year without noticing any problems - track days and all! Best £5 ever spent!

[chillerman]

I had a tyre constantly but slowly, losing pressure over a few days. Tried new tyres, c/w valves, checking for punctures etc etc. Turns out that hard cornering etc must have led to air escaping, although when the tyre was off the car and leak tested it was ok, hence we couldn't find what was wrong.
Ended up that my 'cup' alloy was had a bit of corrosion inside that was preventing the tyre sealing correctly. The tyre fitter cleaned up the area inside the wheel with a wire brush and bingo, problem cured. I was made up 'cos it had been a right saga.