The 2018 Mercedes-Benz Trucks G550 4x4 stands apart even within the modern G-Class world, blending military-rooted utility with the dramatic portal-axle stance that made the 4x4 squared such a distinctive specialty SUV. Tire choice matters on a vehicle like this because the tall ride height, aggressive proportions, and oversized wheel package are central to both its appearance and its road presence. This model uses a 325/55R22 radial tire on a 22-inch rim. That keeps the decision focused less on multiple factory fitments and more on selecting the right radial in the proper size while confirming wheel, clearance, and overall setup on an unmodified or altered vehicle.
Which Tire Size Is Right for The 2018 Mercedes-Benz Trucks G550 4x4
The 2018 Mercedes-Benz Trucks G550 4x4 uses one primary tire size: 325/55R22, a radial fitment for a 22-inch rim. The Base sub-model uses that same size, so the main decision is not choosing between multiple factory sizes, but making sure any replacement stays true to the original sizing format and matches the vehicle's actual wheel and suspension setup.
A 325/55R22 size uses a modern metric radial format: 325 is the nominal section width in millimeters, 55 is the aspect ratio, R identifies radial construction, and 22 is the rim diameter in inches. On the 2018 Mercedes-Benz Trucks G550 4x4, this is the primary fitment and it matches the vehicle's contemporary high-capacity, large-wheel tire profile. Buyers looking at this size should focus on staying within the correct 22-inch radial specification and confirming that the wheel dimensions and vehicle stance have not been changed in a way that affects clearance or overall fitment.
Fitment is straightforward for the covered 2018 Mercedes-Benz Trucks G550 4x4 sub-models because the same primary tire size is used throughout. That makes sub-model confirmation simple, while still leaving wheel setup and vehicle modifications as important checks before replacement.
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2018 Mercedes-Benz Trucks G550 4x4 Base
The 2018 Mercedes-Benz Trucks G550 4x4 Base uses the same 325/55R22 radial tire size as the core model fitment. Tire selection is therefore centered on maintaining the proper modern metric size and confirming that the 22-inch wheel setup remains consistent with the vehicle's current configuration.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Frequently Asked Questions
Owners typically want to confirm the correct 325/55R22 size, understand what that size means, and know what to inspect before putting a heavy, specialized G550 4x4 back on the road. These FAQs focus on fitment, wheel considerations, tire selection, and real-world maintenance checks.
Tire Size & Fitment
What tire size fits a 2018 Mercedes-Benz Trucks G550 4x4?
The 2018 Mercedes-Benz Trucks G550 4x4 uses a 325/55R22 tire size. That is a modern metric radial size, and it is the primary fitment for this vehicle.
That makes the first step fairly simple: match the replacement tire to 325/55R22 and confirm that the wheel is still the correct 22-inch diameter. On a specialty vehicle like the G550 4x4, it is also worth checking whether aftermarket wheels, suspension changes, or body modifications have altered the original clearance relationship before choosing a replacement.
What size rim does a 2018 Mercedes-Benz Trucks G550 4x4 use?
The primary tire fitment for the 2018 Mercedes-Benz Trucks G550 4x4 is built around a 22-inch rim. The 325/55R22 size itself ends with 22, which identifies the wheel diameter the tire is intended to mount on.
Wheel diameter is only part of the fitment picture, so it helps to confirm the actual wheel on the vehicle before replacing tires. A 22-inch wheel with a different width or offset than the original setup can affect sidewall shape, clearance, and overall stance, especially on a tall, wide-tire vehicle such as the G550 4x4.
Do all 2018 Mercedes-Benz Trucks G550 4x4 sub-models use the same tire size?
The covered sub-model fitment is consistent. The 2018 Mercedes-Benz Trucks G550 4x4 Base uses the same 325/55R22 radial tire size as the core vehicle fitment.
That consistency simplifies replacement because there is not a second primary size to sort through by trim. The practical check is making sure the vehicle still has its intended wheel and suspension configuration, since changes to ride height, wheel width, or offset can matter even when the original sub-model fitment itself is straightforward.
Choosing the Right Tire
What should I consider when choosing a 325/55R22 tire for a 2018 Mercedes-Benz Trucks G550 4x4?
Start with the correct size and construction: 325/55R22 in a radial design. Since the 2018 Mercedes-Benz Trucks G550 4x4 uses one primary size, the main goal is preserving the proper overall fitment rather than sorting between multiple factory tire sizes.
After size, focus on whether the wheel setup remains stock in diameter, width, and offset, and whether the vehicle has been modified. On a wide, tall application like this one, even small setup differences can influence fender clearance, steering sweep, and tire profile, so matching the size code alone should not be the only checkpoint.
How do I choose between the available 325/55R22 tires for a 2018 Mercedes-Benz Trucks G550 4x4?
The most important filter is staying with the correct 325/55R22 sizing format on a 22-inch rim. Once that is established, compare the tires by overall intended use, load suitability, tread character, and how closely each option matches the vehicle's current wheel and suspension setup.
A G550 4x4 can place very different demands on a tire depending on whether it is kept as a collector-driven SUV, used regularly on pavement, or fitted with non-original wheels. Comparing fitment-related details carefully helps narrow the field without assuming that every tire carrying the same size code will behave the same way on every setup.
What rim-fitment details should I compare when choosing 2018 Mercedes-Benz Trucks G550 4x4 tires?
Diameter comes first, and this vehicle's primary fitment uses a 22-inch rim. Beyond that, the wheel's actual width and offset matter because they influence how a 325/55R22 tire sits on the wheel and how much room it has near suspension parts, steering components, and bodywork.
Those checks become especially important if the G550 4x4 no longer has its original wheel package. Verifying the wheel dimensions before ordering replacement tires helps avoid choosing a tire that matches the size code on paper but creates unwanted rubbing, altered sidewall shape, or other avoidable fitment issues in real use.
Restoration & Appearance
Which tire should I choose for a period-style 2018 Mercedes-Benz Trucks G550 4x4?
A period-style approach starts with the original sizing format, which for the 2018 Mercedes-Benz Trucks G550 4x4 is 325/55R22 in a radial construction. Keeping that size preserves the modern oversized-wheel look that is a defining part of this model's visual identity.
Because this is a recent specialty vehicle rather than a mid-century classic, appearance usually centers on maintaining the proper modern stance rather than recreating an earlier bias-ply presentation. Buyers concerned with originality should compare the tire's look against factory-era photos, build documentation, and marque-specific references before making a final choice.
Does correct tire fitment matter for a 2018 Mercedes-Benz Trucks G550 4x4 restoration?
Yes, correct tire fitment matters because the 2018 Mercedes-Benz Trucks G550 4x4 relies heavily on its height, wheel-to-tire proportion, and wide stance for its intended appearance. The correct 325/55R22 size helps preserve that visual balance while keeping the fitment aligned with the vehicle's original radial specification.
Even on a newer collector vehicle, the wrong size can change the way the truck sits and fills the wheel openings. Anyone restoring or preserving one should verify wheel diameter and current setup carefully, especially if the vehicle has passed through multiple owners or received cosmetic changes that may have altered the original package.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Mercedes-Benz Trucks G550 4x4?
Yes, modifications can affect tire fitment even when the replacement tire remains 325/55R22. Changes to wheel width, wheel offset, suspension height, or body clearance can alter how that size sits and whether it clears consistently during steering and suspension movement.
That is especially relevant on a vehicle with wide tires and a specialized chassis layout. A G550 4x4 that has aftermarket wheels or suspension changes should be checked carefully at full steering lock and through suspension travel, rather than assuming that the original size code alone guarantees the same results as the factory setup.
What should I inspect before driving a 2018 Mercedes-Benz Trucks G550 4x4 on new tires?
Check that the tires match the correct 325/55R22 size and are mounted on the proper 22-inch wheels, then inspect air pressure, bead seating, valve stems, and visible clearance around the suspension and body. A short visual review after installation helps catch problems before the first longer drive.
It also helps to look over the vehicle's alignment condition and confirm there is no rubbing at parking-lot speeds with the steering turned in both directions. On a heavy specialty SUV, small fitment issues can become more obvious once the vehicle is loaded and moving, so an early recheck is a sensible step.
How should 325/55R22 tires on a collector 2018 Mercedes-Benz Trucks G550 4x4 be maintained?
Collector-use tires still need regular attention even if the vehicle is driven sparingly. Check pressure routinely, inspect for cracking, cuts, bulges, uneven wear, or slow air loss, and keep an eye on overall condition rather than judging the tire only by remaining tread depth.
Storage conditions matter too, especially for low-mile vehicles that spend long periods parked. Keeping the G550 4x4 away from prolonged sunlight, heat, moisture, and ozone sources can help preserve tire condition, and a pre-drive inspection is wise anytime the vehicle has been sitting for an extended stretch.
