troop12

My 2020 Sierra does the same thing. 1,500 miles on it. Had it realigned and still does it. Anyone find out what's causing this or a fix for it yet? Thanks

20x9 0 offset, 275/60/20. 5mm spacer to clear caliper. 2 inch level.

Ok, thanks for taking the time to explain that. I have another set of wheels coming to try, 20x9 0 offset with 275/60/20 Nitto Ridge Grappler tires. I'm hoping the 0 offset takes care of the rubbing issues. If not I will definitely try this. I saw a few people in the custom offsets gallery running 20x9 0 with the same tires and had no rubbing issues and didn't have to do any trimming but I'm not sure what info to trust on that gallery anymore.

Yes, I saw this too which is why I was confused. A few people in the custom offsets gallery claim they're running 20x10 -24 with a 33x12.5 on a level with no rub, no trimming on new body Sierra (not AT4). I tried 2in spacers with my 20x9 -12, 275/60/20 just to see how bad it would be and you get maybe one full turn before the back side of the tire burys into the inner fender.

Thanks for the info. What exactly is the mud flap mod? My truck had big mud flaps on it when I got it but I took them off and put a factory cap on there so it sits flush with the rocker. Nothing hangs down beyond the rocker. But I did notice behind the inner fender liner a black bracket. What is the mod that has to be done? Again thanks for all the info!

Is anyone running a 20x9 0 offset wheel with a 275/60 20 or bigger tire on a 19 or 20 GMC Sierra with a 2 inch level? If so any issues with rubbing? I have set of 20x9 -12 wheels with a 275/60/20 tire from my 2017 Silverado I went to put on my new Sierra and they rub like crazy on the back side of the tire against the inner fender. Front clears fine. I want to buy a new set of wheels and tires for the truck but I want to make sure I get the correct offset so I don't have any rubbing issues. Also, does anyone know the factory offset on the 20 inch wheels that come on the new Sierra Elevation? I know the wheel is 20x9 with a 275/60/20 tire but not sure the offset. Im assuming its something like +27 +28 but I have found conflicting info online. Any info anyone can provide on what offsets will clear is greatly appreciated. Thanks!

Ok, I will just get the same wheels with a 0 offset and same size tire. Thanks for the help.

Ok so a 20x9 0 offset with my same 275 60 20 tires should clear better?

That's what I thought. It sounded weird to me. All I have is a 2in rough country level. I made sure he knew that to. So if adjusting is not possible I'm still confused as to why my setup rubs but others running wider wheels with more offset and bigger tires do not. Is there anything else with the truck that could be wrong causing this?

Thanks for the response. Thats what I was thinking at first too. But I went to custom offsets website and they have a gallery of trucks with different wheel and tire set ups so people can look and see what fits and what not. There are people running bigger and wider wheels/tires on their 19-20 Sierras with a 2in level with no issue. Most are running a 20x10 -24 with a 33x12.5 and not having an issue or at most a slight rub at full turn. Thats what has me confused. I called custom offsets to ask them about this. They said my set up should fit and not rub. They said to take my truck to a shop and have the sub frame moved forward. Has anyone ever heard of this? Can the sub frame even be adjusted?

So I purchased a 2020 GMC Sierra Elevation about a month ago. I put a 2in Rough Country leveling kit on it a couple weeks ago. I bought a set of wheels and tires from Custom Offsets, 20x9 -12 offset with a 275 60 20 Nitto Ridge Grappler tire. They said those will fit this truck. I went to put them on today and they clear the caliper just fine but they rub like crazy. The back side of the tire makes contact with the inner fender where the mud flap would go if there were mud flaps on the truck. Mine does not have mud flaps just the cap that goes where the mud flap would be. Its not just a slight rub on the inner liner either its making pretty good contact. My question is what size wheel and tire can I fit without having any rubbing issues? I am not sure why its rubbing so much because this setup isn't that far off what the factory wheels and tires are. The only difference is the offset. If I run the same 20x9 with more offset will it clear? Add a spacer maybe? I wanted to get a little more info before looking at another set of wheels because I don't want to have this same issue again. Any information you can provide is greatly appreciated. Thanks!

Once I put the innertube in between the leafs the noise has completely gone away. Going on more than 6 months now I believe. I used quite a bit of it. I cut 5-6 inch pieces, folded them up and put them in between each leaf. I put one about every 4-5 inches in between the leafs. Around 8 on each side. Every couple of days at first I had to reposition some but after a couple weeks they start to stay put. I check them once a month now just to see and they rarely seem to move. I separated the leafs with a pry bar and a micro fiber towel on the end. Hopefully this helps some of you with this issue because I know how annoying it is and how frustrating it is to deal with the dealers that are no help at all.

I did end up putting pieces of a tire inner tube between the leafs and as far as I can tell no more noise. Thanks... Still wish GM would fix it properly though.

I am hoping to be able to try it this weekend.

Ok thank you. I will give that a shot. GM claims they are currently working on a fix for this noise but they couldn't give me a time frame so I agree with you that it will never happen. It's too bad because I love this truck but I don't like doing business with a company that knows there is an issue with a part and refuse to fix it no matter how big or small the problem is. Thanks again. Any other info and suggestions are appreciated.