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Old 09-15-2021, 01:10 PM   #1
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Aluminum Rim pitted

We just had some new tires put on our 2002 Monaco Executive and when they took the rubber off of the front Alcoa aluminum rims we got quite a surprise.

The rims on the inside edges were pitted to the extent you could fit your finger in some of the pits. The installer said some looked like they were just about thru the rim.

Had to buy two new rims.

Anyone seen or heard of this happening….or ideas on what causes this.
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Old 09-15-2021, 01:48 PM   #2
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Any pictures of this phenomenon?
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Old 09-15-2021, 02:14 PM   #3
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Very odd since aluminum does not rust but it could deteriorate. Picture would be great.
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Old 09-15-2021, 06:16 PM   #4
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Quote:
Originally Posted by Coarsegold View Post
Very odd since aluminum does not rust but it could deteriorate. Picture would be great.
Aluminum does corrode. That sounds like the tire had water inside for a long time.
reference: https://www.allmetalsfab.com/does-aluminum-rust/
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Old 09-15-2021, 08:36 PM   #5
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What is the procedure for posting pictures on this form?

The pitting was in the area where the bead of the tire sits. The tech said that usually when they see this they buff it out but said that he’s never seen one this bad especially under the bead.

Some of the pits were as big as your little finger and some were almost thru the rim.
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Old 09-15-2021, 10:40 PM   #6
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What is the procedure for posting pictures on this form?

The pitting was in the area where the bead of the tire sits. The tech said that usually when they see this they buff it out but said that he’s never seen one this bad especially under the bead.

Some of the pits were as big as your little finger and some were almost thru the rim.
Check reply #7 in the link below, the thread also offers other helpful information for navigating the forums

https://www.irv2.com/forums/f62/foru...ics-49134.html
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Old 09-16-2021, 08:10 AM   #7
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Old 09-16-2021, 08:31 AM   #8
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I've never heard of plain water corroding aluminum, but aluminum is a soft metal and any sort of chemical in the water can eat away at it. I could conjecture how that might happen, e.g. somebody used an ersatz balancing bead or fluid inside the tire.


I had chrome wheels on a 2014 Buick that corroded like that along the bead. About once a year a tire would develop a slow leak and had to be dismounted and the bead area sanded smooth to get a tight seal.
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Old 09-16-2021, 11:15 AM   #9
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There was no sign of moisture or balancing beads when tire was dismounted. however it is a 20 yr old motor home that was bought used. Low mileage, 23,000 miles when purchased 7 Yrs ago. Now has 70,000. One of the tires on the pitted rim was loosing slight air pressure.

We wonder if sometime during its life span someone used the wrong type of lubricant/soap when mounting the tires.
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Old 09-16-2021, 03:11 PM   #10
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For what it's worth, a Monaco Executive should have come with 8.25 X22.5" Accuride aluminum wheels.
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Old 09-16-2021, 06:09 PM   #11
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grldst,
First off, are those pics, pics of your wheels? If so, I don't see any holes the size of a small finger tip, unless I'm blind which could be. Second, yes, aluminum DOES corrode, just like steel rusts. But, the conditions must be there for corrosion to take place. In other words, AIR must be present, along with other corrosive chemicals like salt etc. If the holes are where you say, the bead of the tires should basically seal the area from air and even intrusive chemicals, from both the inside and outside.

But, the fact is that you do have some corrosion there. But, based on the pics I see, a correct size flap sanding wheel along with some WD-40 (as a lubricant to carry away sanding residue and particles) would have cleaned up at least what I see in the pics. Maybe not to brand new specs but, good enough to install new tires. But again, based on what I see, it doesn't look that bad.

But, if you've already bought new wheels then, you're good to go. Good luck.
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Old 09-17-2021, 06:22 AM   #12
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I can't see the deep pits wither. It looks kinda normal to me.
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Old 09-19-2021, 01:36 PM   #13
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To me the pictures appear to show unusual wear from underinflation causing the tire bead to squirm on rim sealing surface instead of corrosion.
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