Not sure what rimDiameter size options are for your 2020 GMC Sierra 3500 HD AT4?
Choose from the options below.
Find your version / option
There are two places to find your tire size. Look directly on your tire sidewall or inside your driver’s side door jamb for your vehicle’s tire size.
Passenger Tire Sidewall
High Flotation Tire Sidewall
Inside Your Door Jamb