Not sure what rimDiameter size options are for your 2021 RAM 1500 Big Horn 4-wheel drive?
Choose from the options below.
Version/Option
Tire Size
Version/Option
Tire Size
275/55R20
275/65R18
Version/Option
Tire Size
275/65R18
Version/Option
Tire Size
275/55R20
Version/Option
Tire Size
275/65R18
Version/Option
Tire Size
275/65R18
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