Mattsgig

I have a 2015 sierra. the carbon fiber edition with the 22" wheels with 285/45R22. I noticed a pretty good vibration between 70 and 75. I also took it in and had them look at it. Nothing they could do. Service told me that it could be a tire or wheel not balanced completely but the wheel balancer would not get to highway speeds. Owner of the dealership was trying to get with GM and see how they could resolve the issue. Since then, I have purchased a leveling kit and Nitto 305/45R22's and it still does the same. The ride is a little smoother especially over bumps but the vibration is still there.

Factory 22" wheels with Terra Grappler G2. Tinted and leveling kit.