The 2018 Mercedes-Benz Trucks G65 AMG blends the upright, military-rooted character of the G-Class with the high-output personality and road presence expected from an AMG model. By this point, the G65 had become as much a statement vehicle as an off-road-capable luxury truck, and tire choice plays a major role in how it looks and drives. The 2018 Mercedes-Benz Trucks G65 AMG uses two radial tire sizes, 275/50R20 and 295/35R21, so the first step is confirming which wheel setup is on the truck. Once that is clear, the real decision centers on matching the correct metric radial size to the vehicle’s current wheels, stance, and intended use.
Which Tire Size Is Right for The 2018 Mercedes-Benz Trucks G65 AMG
Two tire sizes apply to the 2018 Mercedes-Benz Trucks G65 AMG, and they do not use the same rim diameter. One setup uses a 20-inch wheel with 275/50R20 tires, while the other uses a 21-inch wheel with 295/35R21 tires. Before selecting a tire, confirm the exact wheel diameter currently on the truck, since that determines which size belongs on your G65 AMG.
275/50R20 is a metric radial size in which 275 is the nominal section width in millimeters, 50 is the aspect ratio, R identifies radial construction, and 20 is the rim diameter in inches. On the 2018 Mercedes-Benz Trucks G65 AMG, this size represents a modern low-profile SUV and performance-truck fitment built around a 20-inch wheel. Its dimensions make it important to preserve the intended wheel pairing rather than treating it as interchangeable with the 21-inch setup. This is the size to evaluate if your truck is wearing 20-inch wheels and you want to keep that wheel-and-tire combination properly matched.
295/35R21 is a metric radial size that uses a 295-millimeter nominal section width, a 35-series aspect ratio, and a 21-inch rim diameter. For the 2018 Mercedes-Benz Trucks G65 AMG, it reflects a larger-wheel, lower-profile tire presentation than the 20-inch setup. The wider section and shorter sidewall make wheel confirmation especially important, since this size belongs on a different rim diameter from 275/50R20. Choose this size only when the truck is equipped with the matching 21-inch wheels and there is no question about the current wheel configuration.
Sub-model fitment is straightforward here because the covered G65 AMG Base uses both supported radial tire sizes. The key is not trim identification so much as confirming which wheel diameter is actually on the truck before selecting between the 20-inch and 21-inch fitments.
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2018 Mercedes-Benz Trucks G65 AMG Base
The G65 AMG Base can be found with either of the two supported radial sizes, so tire selection depends on the wheel setup already installed. That makes wheel-diameter confirmation the most important step before comparing tire options or replacing a full set.
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 usually have the same first questions about the 2018 Mercedes-Benz Trucks G65 AMG: which tire size belongs on the truck, how the 20-inch and 21-inch setups differ, and what to inspect before putting fresh tires into service.
Tire Size & Fitment
What tire size fits a 2018 Mercedes-Benz Trucks G65 AMG?
The 2018 Mercedes-Benz Trucks G65 AMG uses two radial tire sizes: 275/50R20 and 295/35R21. Those sizes correspond to two different wheel diameters, so both are correct fitments for this model depending on the wheel setup currently on the vehicle.
The important next step is confirming whether the truck has 20-inch or 21-inch wheels before ordering tires. Since these sizes differ in both profile and rim diameter, they should not be treated as interchangeable without checking the actual wheels, overall setup, and any changes made by a previous owner.
What size rim does a 2018 Mercedes-Benz Trucks G65 AMG use?
The 2018 Mercedes-Benz Trucks G65 AMG uses either a 20-inch rim with 275/50R20 tires or a 21-inch rim with 295/35R21 tires. Both fitments are radial and belong to this exact model, but they are tied to different wheel diameters.
Because the truck can use either setup, the safest approach is to read the tire sidewall and verify the wheel itself before choosing a replacement. This matters even more on vehicles that may have had wheel changes, since the correct tire size follows the installed rim diameter rather than the model name alone.
Why does the 2018 Mercedes-Benz Trucks G65 AMG have more than one tire size?
The 2018 Mercedes-Benz Trucks G65 AMG has more than one tire size because it was fitted with more than one wheel-diameter setup. One uses 275/50R20 on a 20-inch rim, and the other uses 295/35R21 on a 21-inch rim.
That means tire selection starts with the truck’s actual wheels, not just the year, make, and model. A G65 AMG with 20-inch wheels needs a different tire than one wearing 21-inch wheels, so checking the current wheel and tire markings helps avoid ordering the right size for the wrong setup.
Choosing the Right Tire
What should I consider when choosing a tire for a 2018 Mercedes-Benz Trucks G65 AMG?
Start with the correct size for the wheel currently on the truck: 275/50R20 for a 20-inch setup or 295/35R21 for a 21-inch setup. Since both fitments are radial, the main selection factors are proper size matching, the wheel diameter already in use, and the kind of road use the vehicle sees.
It also helps to inspect whether the G65 AMG is still on its original wheel configuration or has been modified. Changes in wheel width, offset, suspension height, or body clearance can affect which tire dimensions are appropriate, even when the vehicle itself is the correct year, make, and model.
How do I choose between 275/50R20 and 295/35R21 tires for a 2018 Mercedes-Benz Trucks G65 AMG?
Choose between 275/50R20 and 295/35R21 by matching the tire to the wheel diameter already on the 2018 Mercedes-Benz Trucks G65 AMG. The 275/50R20 size belongs on a 20-inch wheel, while 295/35R21 belongs on a 21-inch wheel.
This is not simply a matter of personal preference because the two sizes are built for different rims and different overall wheel-and-tire combinations. Verifying the current setup at the truck is especially important if the vehicle has changed hands or has been upgraded with aftermarket wheels at some point.
What does 275/50R20 mean on a 2018 Mercedes-Benz Trucks G65 AMG?
On a 2018 Mercedes-Benz Trucks G65 AMG, 275/50R20 is a metric radial tire size. The 275 is the nominal section width in millimeters, 50 is the aspect ratio, R means radial construction, and 20 indicates the tire fits a 20-inch rim.
Understanding the code helps prevent a common mistake: focusing only on width while overlooking wheel diameter and profile. For this truck, the full size matters because it defines the complete tire-and-wheel relationship, and changing only one part of that formula can create fitment or clearance problems.
Restoration & Appearance
Does correct tire fitment matter for a 2018 Mercedes-Benz Trucks G65 AMG restoration or preservation project?
Correct tire fitment matters on a 2018 Mercedes-Benz Trucks G65 AMG because the vehicle’s appearance and stance are closely tied to its wheel-and-tire combination. Using the proper 275/50R20 or 295/35R21 size helps preserve the intended relationship between the body, wheels, and sidewall profile.
For a preservation-minded truck, it is worth confirming whether the current wheels match the configuration you want to maintain long term. That is especially important on modern collector vehicles, where a change in wheel diameter or tire profile can alter the visual character even before it affects road behavior.
How does tire size affect the appearance of a 2018 Mercedes-Benz Trucks G65 AMG?
Tire size has a strong effect on the appearance of a 2018 Mercedes-Benz Trucks G65 AMG because the two supported sizes create different visual proportions. A 275/50R20 setup presents more sidewall, while a 295/35R21 setup pairs a wider, lower-profile tire with a larger wheel diameter.
That makes size selection about more than simple replacement. Anyone trying to preserve a specific look should confirm which wheel package is on the truck now and whether it reflects the appearance they want to keep, especially before mixing replacement tires into an existing wheel setup.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Mercedes-Benz Trucks G65 AMG?
Yes, modifications can affect tire fitment on a 2018 Mercedes-Benz Trucks G65 AMG even when the tire size looks close on paper. Wheel changes, offset differences, suspension alterations, or body modifications can all change how a 275/50R20 or 295/35R21 tire sits in the wheel opening.
A truck that has aftermarket wheels or a changed ride height should be checked carefully before replacing tires. Clearance at the fender, inner wheelhouse, and steering range matters, and the safest approach is to verify the actual wheel specs and current tire dimensions already working on the vehicle.
What should I inspect before driving a 2018 Mercedes-Benz Trucks G65 AMG on new tires?
Before driving a 2018 Mercedes-Benz Trucks G65 AMG on new tires, inspect the wheel size, tire pressure, valve stems, and the basic condition of the wheels themselves. It is also smart to confirm that the new tires match the correct installed rim diameter, either 20 inches or 21 inches.
A short visual clearance check can prevent problems once the truck is back on the road. Turn the steering from lock to lock, look for signs of rubbing, and keep an eye on air loss or vibration during the first drives, especially if the vehicle has been sitting or recently changed wheel setups.
How often should tires on a 2018 Mercedes-Benz Trucks G65 AMG be inspected?
Tires on a 2018 Mercedes-Benz Trucks G65 AMG should be inspected regularly, not just when tread wear becomes obvious. A quick check for cracking, bulges, cuts, uneven wear, and pressure loss is worthwhile before normal use, and it becomes even more important on a low-mileage collector or specialty vehicle.
Stored vehicles can age their tires without putting on many miles, so visual condition matters as much as tread depth. Checking them before longer drives also helps catch clearance or wear issues early, particularly if the truck runs large-diameter wheels or has had suspension and wheel changes over time.
