Are cracks in a mag wheel...
 

obvious? I dropped a mag wheel on the concrete garage floor. I was planning on selling the four Lexus mags which I do not need anymore. Can you have a crack in it and not be obvious to the naked eye? Does a tire have to be put on it first to see if there is a slow leak in it? Or is there a special spray that I can use which would emphasize if there is a crack?

Thanks all,
Guy

Mag wheel? Groovy man, far out, that's like a total gas!!! I like, totally dig a b*tchin mag wheel, mags are boss!!!

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I'd give it a 'ring' test like you do to a stone wheel before putting it on a bench grinder.
Does it 'ring' like the others?
I think a crack will cause it to have a different sound to it.
Mounting a tire and water testing would be the next move.

I honestly think it would take a whole lot more than a waist level drop on a concrete floor to crack a factory aluminum wheel . Usually, when I find a crack, it is accompainied by a large dent, and some suspension repair.
You should be able to visibly see a crack, but I have had a few over the years, where I could see air leak out through the wheel, yet not really be able to see the " crack " per se .
A factory Lexus aluminum wheel, is a quality, thick aluminum wheel, If I were a betting man Id just send it

It's not "mag" it's aluminum.

And dropping one will bend it before it cracks it.

If you want to waste some money anyway, look around a large airport for a facility that does dye penetrate inspection.

How far did it drop? Did it dent? Something like Ardrox P6R Dye and 9D1B developer would work well but it is about $50 for the two cans. You could try using a non permanent magic marker on that area and then wipe the surface clean to try and show any cracks, check that it does not stain your rim surface coating first.

Find a forklift inspector. They will do it cheaper. They do masts and forks.

Another idea is to take it to your tire centre/wheel balancing guy.

I had bought a set of Fuchs I was a bit suspicious about and took them to my wheel balancing guy. He noticed a repair that I hadn't seen, spun it up on the balancing machine, and said the wheel would never be right. Hence sent them back.

These guys are experts at spotting faults.

Not sure they'd be equipped to do aluminum, as I figure that they mostly check steel parts. Next time I need that service, I'll check it out.