Mercedes-Benz G550 4x4 tire size
The most common factory tire size for the Mercedes-Benz G550 4x4 is 325/55R22, on 2 of the 2 year and trim fits listed. The table lists every year from 2017 to 2018 and the size each trim was built with. Pick your year and trim to see the tires that fit.
Check your own tire
A trim can be sold with more than one wheel size. The size printed on the sidewall of your current tire, or on the placard in the driver's door jamb, is the one your vehicle has.