I currently own a 2012 Chevy Tahoe LT.
I am looking to replace the factory stock 17" rims and tires with 20" or 22" rims w/tires.

What is the maxium size I can place on my stock 2012 Tahoe? I dont know much about the Tahoe and the rim sizes, I have done a little research and have found that you can put up to 24" rims on the Tahoe. But I was not sure if I need to add anything to the vehicle to get the 20" or 22" rims on? Will this cause rubbing against the car? Do I need to recalibrate the speedometer or anything?

Any help would be great.