Need new tyre valve caps - do they come in different sizes

Iceweasel

facade wrote: »

Yes you are right, they undo them off the new valves and then replace them, and simply cut off the old valve with them still on.

I don't think that's right at all.

To fit a new tyre the old tyre has to be completely deflated first.

The fitter removes the valve cap, and then the inner valve core.

The old valve is cut off from the inside after the old tyre has been completely removed from the wheel.

So there are actually 4 bits of the old valve kicking around loose to be swept up.

Next time you visit a tyre fitter I'd be having a look for metal caps.

Nodding_Donkey

Richard53 wrote: »

Only if you leave them in place for months. If you check the pressures regularly, this shouldn't happen.

Not true, I've had it because the car was parked up for two weeks while I went on holiday

Iceweasel

Nodding_Donkey wrote: »

Not true, I've had it because the car was parked up for two weeks while I went on holiday

Valve-cap geek again.

It's the galvanic corrosion between the brass thread of the valve and the aluminium of those coloured caps.

The reaction is caused by water on the threads and is accelerated in winter if there is any salt around.

There is little or no reaction with the steel caps.

facade

Iceweasel wrote: »

To fit a new tyre the old tyre has to be completely deflated first.

Most times they just press the tyre off inflated to save time. This is no doubt in contravention of every H&S directive going and likely damages the wheel, but is what they do. They only deflate the tyre if the machine can't press it off inflated.

mattyprice4004

facade wrote: »

Most times they just press the tyre off inflated to save time. This is no doubt in contravention of every H&S directive going and likely damages the wheel, but is what they do. They only deflate the tyre if the machine can't press it off inflated.

Luckily no-where around here does that, and I've been to at least 5 different places. That's madness!

nobbysn*ts

facade wrote: »

Most times they just press the tyre off inflated to save time. This is no doubt in contravention of every H&S directive going and likely damages the wheel, but is what they do. They only deflate the tyre if the machine can't press it off inflated.

No one does that.