Rust/Pitting on inside of wheel

[reardiff]

Anyone had any rust/pitting spots on the inside of their wheels?  Was rotating the tires yesterday and three of the 4 looked fine but one had small rust spots all over and wasn't sure why just the one? Just on the inside, the outside facing finish appearance is fine but worrying about it spreading. These are the 20 inch snowflake polished aluminum wheels with 25,000 miles on them.   Is this something that would be covered under warranty? Notice how it's only in the middle and the two 1 inch or so rings around the edge that don't show any rust spots?  Pictures below.  First two are the wheel in question,  Last picture is a different wheel for comparison and they way the other three look, like they should.

 

 

 

 

 

 

 

[Gmman]

Looks like metal from the brake rotor or pads.

[dieselfan1]

4 minutes ago, Gmman said:

Looks like metal from the brake rotor or pads.

It is  

It will come right off with some of this.

[Lsgun1]

Clay bar would take it off too.

[newdude]

You can also try something like this:  https://adamspolishes.com/collections/exterior-wheel-tire-car-care-detailing-products/products/adam-s-deep-wheel-cleaner

 

I use it, works great.  Takes brake dust off my brother's 2019 ZL1 like nothing, and those OE pads make some dust.  

[reardiff]

fantastic, good to hear this should come off.  What's odd is it's just the one wheel, the other three look fine, and the wheels have been rotated every 5k miles so they have spent equal time under different brake/rotors so not sure why just this one wheel is this way?   I'll get some polish and give it a shot..

[Mike GMC]

Did you look to see how much brake pad you have left on the wheel location?  With my 25k miles, they shouldn't be work out, but metal to metal on the brakes makes a mess.of your wheels.  You may have a brake problem the word out 1 pad prematurely.

[L86 All Terrain]

It's a good idea to clean the backside of these fancy 20" wheels every time you do a rotate or have the wheels off to reduce the build up. I hit mine with brake clean then with that rough side (green side) of a sponge and some hot soapy water and some spray wax. If you put a layer of wax on it wont be so tough to remove it next round.  

[reardiff]

1 hour ago, Mike GMC said:

Did you look to see how much brake pad you have left on the wheel location?  With my 25k miles, they shouldn't be work out, but metal to metal on the brakes makes a mess.of your wheels.  You may have a brake problem the word out 1 pad prematurely.

I haven't looked, mostly because I didn't think at 25k miles I needed to but now I think I will. Don't hear any unusual braking noises or rotor wear but worth a check, something made that happen.

 

56 minutes ago, L86 All Terrain said:

It's a good idea to clean the backside of these fancy 20" wheels every time you do a rotate or have the wheels off to reduce the build up. I hit mine with brake clean then with that rough side (green side) of a sponge and some hot soapy water and some spray wax. If you put a layer of wax on it wont be so tough to remove it next round.  

Aren't the inside of the wheels clear coated?  If so, is brake clean going to be to harsh and strip the clear off?  I can see a coat of wax helping with the corrosion and build up, especially up here where the salt is thick.

[L86 All Terrain]

1 minute ago, reardiff said:

Aren't the inside of the wheels clear coated?  If so, is brake clean going to be to harsh and strip the clear off?  I can see a coat of wax helping with the corrosion and build up, especially up here where the salt is thick.

I use Kleen-Flo brake/parts cleaner, no issues. You could get away with something less intense like a proper wheel cleaner or even a strong glass cleaner but an alcohol based brake cleaner wont eat the clearcoat. I have a truck shop so I have cases of the stuff laying around so that is what I usually reach for. Or if you want to stay away from chemicals entirely take LSgun1's advice and use soapy water and a chunk of clay. 

[Nanotech Environmental]

I rotate every 10,000km and use my own products to clean the rims etc. thoroughly, front and back, at each rotation. It takes about 2 minutes per wheel.
I take the aluminum wheels off for the winter as well. After 80k miles, each aluminum wheel is still in very good shape.