Tyre pressures

[E55BOF]

They are metal with a built in seal. If the valve fails the tyre won't lose pressure like the standard plastic ones. Also too they are far easier to find if you drop them

I recently had tyres fitted to my new wheels, and mentioned the metal valves fitted to my old Carlssons. The fitter said that they never had any problems with the rubber valves, but it was an entirely different story with metal valves.

 

[John Jones Jr]

I recently had tyres fitted to my new wheels, and mentioned the metal valves fitted to my old Carlssons. The fitter said that they never had any problems with the rubber valves, but it was an entirely different story with metal valves.

I'm a bit lost? You're talking about valves where I was discussing the advantages of metal valve caps (as used on commercial vehicles).

 

[paul_f]

I recently had tyres fitted to my new wheels, and mentioned the metal valves fitted to my old Carlssons. The fitter said that they never had any problems with the rubber valves, but it was an entirely different story with metal valves.

I wonder if that is because the metal valves probably aren't replaced as often, if at all?

 

[E55BOF]

I'm a bit lost? You're talking about valves where I was discussing the advantages of metal valve caps (as used on commercial vehicles).

My misunderstanding...

 

[ItalianTuneUp]

I'm lost now, could someone say what's what?

 

[E55BOF]

JJJ was talking about valve caps, I was talking about valves.

 

[ItalianTuneUp]

So what is best to have to prevent air loss?

 

[hotrodder]

Metal valve dust caps with a rubber seal won't stop air leaks from corrosion etc preventing the valve body and/or tyre bead sealing against the wheel

Plastic valve caps will never gall/seize to the valve stem, are less likely to be nicked than shiny metal examples and if/when Johnny five thumbs cross threads them the cap breaks leaving the valve stem undamaged

Valve cores can be quickly and easily changed without having to remove & refit the tyre in the unlikely event they leak. The dust caps job is to keep crud out of the valve (which can kill it), not keep air in the tyre
I can't remember the last time i had a slow 'puncture' due to a leaking valve core. When there isn't a nail or whatever in the tyre then 99.9% of the time it's the tyre bead

Accuracy is often confused with things like precision, resolution and repeatability... http://paladintechworks.com/index.p...n-repeatability-and-accuracy-in-the-cnc-worldhttp://www.zettlex.com/articles/accuracy-resolution-repeatability-stuff/

 

[ItalianTuneUp]

Thanks hotrodder, that has clarified things.

I'll get the tyre beads looked at.

I suppose there is no obligation on the behalf of the tyre fitters to check this when fitting the tyres?

So if I go back to the tyre fitters and tell them the issue, they'll take the tyres off, clean the bead up and then put the tyres back on again? And I suppose that they'll not do this for free, and say I never asked them to clean the bead up before fitting new tyres? In that case, what is a reasonable charge?

 

[paul_f]

What wheels are they, I wonder if they are ones that are known to be porous?

In any case, I would go back to the tyre supplier and say that all 4 wheels go down over a few days and wondered what could cause it? Depending on what company it is they may not charge

 

[ItalianTuneUp]

The wheels I have are these ones:

https://i.ytimg.com/vi/UJZ_TDSkpeo/maxresdefault.jpg