Enamel for alloy wheel?

[Avocet]

No. Not possible for brake debris to get under paint. The iron came directly from the factory.

Ah... always the conspiracy rather than the reality...

The mechanism is well understood, (well, by sane people, at any rate...)

Asbestos-free pads tend to contain ferrous compounds in the friction material. They're way harder than old style brake pads, hence the high disc wear rate these days. Ferrous particles from both the pad and the disc that make up part of the brake dust sit on the painted surface of the wheel and eat into the lacquer as they "rust", if the wheels aren't cleaned regularly.

But by all means, if you prefer to go with the sinister masked saboteur, sneaking round the aluminium foundry with his egg cup full of iron filings, intent on mischief, that's OK with me...

 

[Avocet]

You wouldn’t even accept an answer if it were from the worlds top expert and you were being paid to accept it. Your 'conversation' would end. Admit it, you’re lonely and the only way you can get to talk to people is to argue with them. How sad. Still, page 4 now. Keep going, you might drag a few more into your lonely sad world.

I would have thought, *especially* if you were the world's top expert!

 

[DiyNutJob]

I would have thought, *especially* if you were the world's top expert!

He's not though. He said valve stem cannot be changed without opening tyre. What do you say? I know you are not a world expert, you just don't have the feel for it.

 

[Avocet]

He's not though. He said valve stem cannot be changed without opening tyre. What do you say? I know you are not a world expert, you just don't have the feel for it.

No, not a world expert, just bright enough to know the things I know a reasonable amount about, and those I don't. (A strategy that has served me well, over the years)... I didn't know there were different valves for alloy and steel rims, for example, so I've learned something from this thread - and probably in a rather easier way than you're about to!

 

[DiyNutJob]

People gamble too much and they loose, with loose mouth!

Job completed with resounding success. A summary of innovation and lessons learned to follow.

 

[Mottie]

He said valve stem cannot be changed without opening tyre.

I said nothing of the sort. I said if there is corrosion inside the rim around the valve stem hole causing a leak, you won’t be able to check and clean it without breaking the tyre bead. I even explained it pictorially as you don’t seem to understand the written word.

 

[Mottie]

People gamble too much and they loose!

Job completed with resounding success. A summary of innovation and lessons learned to follow.

View attachment 417802

All that shows is a tyre being pumped up. You could do that with a leaking valve, a leaking bead seat or even a small hole in the tyre. Proves absolutely nothing.

 

[DiyNutJob]

Job description:
To demonstrate Mottie is wrong, inexperienced, and wrong some more about tyre fitting.

Job personnel:
First time fitter.

Job schedule:
3.5 hours.

Job materials:
22 year old tyre, 26 year old rim, new china aluminum-alloy tubed valve stem, tyre paste, tyre sealant, soapy water, 2x 24 inch tyre iron, 2x 300mm f-clamps, 3d printed wedging tool.

Job methodology:
Prying, praying, head scratching, losing hope and accepting defeat, elation.



Tyre is locked in place to prevent it "walking" while prying elsewhere. One clamp for the part of tyre above the wheel face, and one clamp for the part of tyre below the wheel face.

3D printed wedging wheels to depress the tyre side to enable the entire tyre side to go into the wheel groove up to the apex of the protective rubber rim flange. These wheels must be removed once the tyre side starts to enter the groove or the entry will be obstructed by the wheels. The tyre side will enter the groove as a result of tensioning from prying. These wheels are printed using petg with a 10% fill.

Deep insertion of the tyre iron allows a hand to be freed. This may or may not be useful.

The wedging wheels protecting the valve stem base and enabling the tyre side to slide under it.

The tyre iron takes a couple of bites out of the thin edge of the tyre bead, oooooouuuuuch!!!

Mission accomplished and later tested with no leaks.

Observations:

1. Paint will be damaged from prying. The wheel metal will be fine. In particular, the paint on the rim edge and the bead seat will be battle scared.

2. There is very little clearance for the tyre edge. The tyre side for the entire tyre must be made to go into the wheel groove as soon as possible to produce a tiny slack.

3. Prying requires alternating between folding the tyre edge below the rim face and pulling the tyre edge away from the rim horizontally. Sometimes, reversing the folding slightly can help positioning the tyre edge. Also the tip of the tyre iron requires constant switching, and the orientation of the tip requires constant changing.

4. To help seating the beads, pick up the wheel, raise it as high as possible, then drop it and catch it like a basketball a good number of times. My beads sat on the first pump. I did give the bead seat as well the tyre rubber plenty of tyre paste. I also ensured the paste go as deep as possible. The valve stem base did keep a gap open with the tyre. But, it did not noticeably affect the inflation. The valve core was removed to increase air flow.

 

[Mottie]

into the wheel groove

Look up 'drop centre' allthough most tyre fitters refer to it as the 'well'.

Well, you’ve all heard the expression 'Using a sledgehammer to crack a nut' and nutjob had just given you a perfect example of this.

Job schedule:
3.5 hours.

More like 3.5 days for a 3.5 minute job.

Job description:
To demonstrate Mottie is wrong, inexperienced, and wrong some more about tyre fitting.

In which you failed spectacularly.

That tyre with sidewall damage is scrap and should never be fitted to a car.

Now try it on a car with undamaged alloys and show us a before and after photo.

Oh, and if you want to remove valves easily and refit them with no damage to the valve or alloy, get yourself one of these:



Or these:



Summary:

 

[DiyNutJob]

You are wrong once again to use google as your source. Modern performance tyres are soft.

 

[Burnerman]

Time this one was closed down......
John

 

[transam]

Rub it down with a bit of steel wool

Aerosol of etch primer from Halfords
Sorted ( colour is ally type )

 

[Mottie]

Time this one was closed down......
John

But, but, but we're only on page 5! Far too soon.

 

[Mottie]

You are wrong once again to use google as your source. Modern performance tyres are soft.

The info was for your benefit. I don’t need to Google anything about tyre fitting. You obviously do as you are a self confessed beginner. Read what I posted again. It doesn’t say the tyres are stiff, it says the steel reinforced beads are stiff.