Not sure what rimDiameter size options are for your 2018 Cadillac CT6 Luxury?
Choose from the options below.
Version/Option
Tire Size
245/40R20
Version/Option
Tire Size
235/50R18
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