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It would be a bit surprising for a wheel to just crack, the only potential for a wheel to just crack is if the wheel is not properly load rated and is fit to the wrong vehicle application. The 22 inch wheels from the factory still have a sufficient amount of tire sidewall that should give the wheels decent cushion from potholes, railroad tracks etc, if GM is having wheels crack under normal driving load of the vehicle, then that is going to be a big costly problem for them to resolve. Good thing you caught this before the wheel came apart. Did it happen on all 4 wheels, or just one or two on the same side?
Seeing where the crack is located on the wheel could also help identify how it happened? Usually it is the area of the inner barrel where the lip rolls out to secure the bead...in this area a crack is definitely most likely from an impact...it is the thinnest and weakest part of the rim as the positive offset on these trucks has the design of the wheel in a full face form, the inner barrel has little support. The standard 285/45 tire does offer some cushion, but the larger 305/45 sidewalls I think give a bit more protection. If it is cracked in the spoke area, then that I would say is something to cause an argument with the dealer and to get GM to replace it...the spoke area is the most robust part of the rim and carries the most load, so if there was impact that they claimed caused this, or even on the inner rim, the tire should also have signs of impact damage as well.Just one wheel and the crack was small. I had driven about 300 miles when it happened on a interstate no potholes, no tracks. Makes no sense to me.
Seeing where the crack is located on the wheel could also help identify how it happened? Usually it is the area of the inner barrel where the lip rolls out to secure the bead...in this area a crack is definitely most likely from an impact...it is the thinnest and weakest part of the rim as the positive offset on these trucks has the design of the wheel in a full face form, the inner barrel has little support. The standard 285/45 tire does offer some cushion, but the larger 305/45 sidewalls I think give a bit more protection. If it is cracked in the spoke area, then that I would say is something to cause an argument with the dealer and to get GM to replace it...the spoke area is the most robust part of the rim and carries the most load, so if there was impact that they claimed caused this, or even on the inner rim, the tire should also have signs of impact damage as well.
In all my years in the wheel business I could always tell when a wheel sustained impact, and in many instances the customers would deny being accountable, but then you mention, did they valet park, or do they have a detailer that washes the car etc. In some cases some people had their cars Ferris Bueller'd and they would say, yeah but I don't think they drove my car?
Not saying this is your situation, but when going to fight the dealer these are scenarios that will be brought up, and for a single wheel, there has to be some explanation.
I assume you would like to know how it happened too!
You say it was driven only 300 miles on the interstate and it's a 2015. Not sure I'm following these 2 things, did you purchase used? If yes, it's certainly possible the crack existed when you purchased the vehicle.