The 2019 Mercedes-Benz Trucks GLS63 AMG blends full-size SUV luxury with serious AMG performance, so tire fitment is not a minor detail on this vehicle. Its combination of high-output power, substantial curb weight, and large wheel packages makes correct size selection especially important for stance, clearance, and road manners. This GLS63 AMG uses radial tires in two sizes, 295/40R21 and 285/40R22, each tied to a different wheel diameter. That means the key decision is not bias-ply versus radial, but confirming which wheel package is actually on the vehicle. Once wheel size is verified, the focus shifts to maintaining the intended look, load capability, and everyday drivability.
Which Tire Size Is Right for The 2019 Mercedes-Benz Trucks GLS63 AMG
The 2019 Mercedes-Benz Trucks GLS63 AMG uses two primary tire sizes, and the correct choice depends first on wheel diameter. Both are radial fitments, but one size is for a 21-inch rim and the other is for a 22-inch rim. Before choosing a tire, confirm which wheel package is on the vehicle, especially if it has aftermarket wheels or a previous owner changed the setup.
285/40R22 is a metric radial size in which 285 identifies the nominal section width in millimeters, 40 is the aspect ratio, R denotes radial construction, and 22 is the rim diameter in inches. On the 2019 Mercedes-Benz Trucks GLS63 AMG, this size belongs with the 22-inch wheel setup rather than the 21-inch package. Its lower-profile format is typical of larger modern SUV wheel combinations where appearance and wheel diameter both matter. Choose this size only after confirming the vehicle is actually on 22-inch wheels and that the current wheel width and overall setup match the intended tire fitment.
295/40R21 is a metric radial size where 295 indicates nominal section width in millimeters, 40 is the aspect ratio, R marks radial construction, and 21 identifies the wheel diameter. For the 2019 Mercedes-Benz Trucks GLS63 AMG, this size is used with the 21-inch wheel package. It is a different primary fitment from the 22-inch option, so the main issue is matching the tire to the actual wheel diameter already on the SUV. This is the size to evaluate when the GLS63 AMG retains its 21-inch wheels and you want to keep the correct basic fitment format for that setup.
Fitment is straightforward here because the covered sub-model uses the same two primary tire sizes already associated with this GLS63 AMG. What matters most is confirming which wheel diameter is on the vehicle before selecting between the 21-inch and 22-inch tire options.
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2019 Mercedes-Benz Trucks GLS63 AMG Base
The 2019 Mercedes-Benz Trucks GLS63 AMG Base uses the same radial fitment pattern, with one tire size tied to 21-inch wheels and another tied to 22-inch wheels. Tire selection starts with verifying the wheel package currently installed, then choosing a tire that matches the intended road use and overall vehicle setup.
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
Common questions for the 2019 Mercedes-Benz Trucks GLS63 AMG usually center on the correct tire size, 21-inch versus 22-inch rim fitment, choosing between the two radial sizes, and checking the wheel and suspension setup before putting the vehicle back on the road.
Tire Size & Fitment
What tire size fits a 2019 Mercedes-Benz Trucks GLS63 AMG?
The 2019 Mercedes-Benz Trucks GLS63 AMG uses two primary tire sizes: 295/40R21 and 285/40R22. Both are radial sizes, and each belongs to a different wheel diameter, so they are not simply alternate labels for the same wheel setup.
The right choice depends on the wheels currently installed on the vehicle. A GLS63 AMG on 21-inch wheels needs the 295/40R21 fitment, while a 22-inch wheel setup uses 285/40R22. Checking the actual wheel diameter before ordering is especially important if the SUV has been modified or has changed hands.
What size rim does a 2019 Mercedes-Benz Trucks GLS63 AMG use?
A 2019 Mercedes-Benz Trucks GLS63 AMG uses either a 21-inch or 22-inch rim, depending on which tire size is fitted. The 295/40R21 size goes with a 21-inch rim, and the 285/40R22 size goes with a 22-inch rim.
Rim diameter is the first fitment detail to confirm because the tire must match it exactly. Measuring the wheel or reading the size stamped on the tire sidewall is the quickest check. Once wheel diameter is confirmed, the next steps are verifying overall condition, wheel width, and clearance around the suspension and body.
Why does the 2019 Mercedes-Benz Trucks GLS63 AMG have more than one tire size?
The 2019 Mercedes-Benz Trucks GLS63 AMG has more than one tire size because it was fitted with more than one wheel-diameter setup. In this case, 295/40R21 is tied to a 21-inch rim and 285/40R22 is tied to a 22-inch rim.
That means tire selection is driven by the wheel package on the vehicle, not by preference alone. A buyer should confirm the actual wheel diameter already installed and avoid assuming that one GLS63 AMG uses the same size as another. Larger aftermarket wheels can also change the fitment picture, so a quick inspection is worthwhile.
Choosing the Right Tire
What should I consider when choosing a tire for a 2019 Mercedes-Benz Trucks GLS63 AMG?
Start with the correct primary size for the wheel package on the SUV: 295/40R21 for 21-inch wheels or 285/40R22 for 22-inch wheels. Since both are radial fitments, the main concern is matching tire size to wheel diameter rather than choosing between older and newer construction types.
After that, look at the vehicle's current setup and intended use. A GLS63 AMG with factory-style wheels may need only the proper size match, while one with aftermarket wheels or suspension changes deserves a closer clearance check. Tire width, overall diameter, wheel width, and the vehicle's weight and performance character should all stay in view.
How do I choose between the available 2019 Mercedes-Benz Trucks GLS63 AMG tire sizes?
Choose between 295/40R21 and 285/40R22 by matching the tire to the wheel diameter on the vehicle. The 295/40R21 size is for a 21-inch rim, while 285/40R22 is for a 22-inch rim, so the wheel package determines the correct path.
This is not a case where the two sizes can be treated casually as interchangeable options. Before deciding, confirm the wheel size actually mounted on the SUV and inspect whether the setup is original or modified. That simple check prevents ordering a tire that matches the model name but not the vehicle's present configuration.
What rim-fitment details should I compare when choosing 2019 Mercedes-Benz Trucks GLS63 AMG tires?
The most important rim-fitment detail is diameter, because the 2019 Mercedes-Benz Trucks GLS63 AMG uses both 21-inch and 22-inch wheel setups. The tire must match that diameter exactly, which means 295/40R21 belongs on a 21-inch rim and 285/40R22 belongs on a 22-inch rim.
Wheel width and the overall wheel setup also deserve attention, especially on a performance SUV where minor changes can affect clearance. It helps to inspect the inside of the wheel, compare the current tire sidewall markings, and check for any signs of rubbing. That matters even more if the GLS63 AMG has custom wheels or suspension changes.
Restoration & Appearance
Does correct tire fitment matter for a 2019 Mercedes-Benz Trucks GLS63 AMG restoration or preservation project?
Yes. Even on a newer performance SUV like the 2019 Mercedes-Benz Trucks GLS63 AMG, correct tire fitment matters for preserving the vehicle's intended stance, wheel relationship, and overall character. Using the proper 21-inch or 22-inch fitment keeps the visual balance much closer to how the vehicle was meant to sit.
Preservation-minded owners should start by confirming which wheel package belongs on their specific vehicle before replacing tires. If originality matters beyond basic sizing, it is worth checking vehicle-specific records, original sales material, or marque guidance. That extra step helps separate a merely usable replacement from one that suits a careful presentation.
How does tire size affect the appearance of a 2019 Mercedes-Benz Trucks GLS63 AMG?
Tire size has a major effect on the appearance of a 2019 Mercedes-Benz Trucks GLS63 AMG because both primary fitments pair a wide tire with a large-diameter wheel. A 21-inch setup with 295/40R21 presents differently than a 22-inch setup with 285/40R22, even though both belong to the same model.
Appearance should still follow fitment, not the other way around. The best approach is to confirm which wheel diameter is on the SUV and then stay with the corresponding tire size. On a vehicle with changed wheels or altered ride height, checking clearance and overall proportions helps avoid a look that seems off or physically conflicts.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 Mercedes-Benz Trucks GLS63 AMG?
Yes. Modifications can change tire fitment on a 2019 Mercedes-Benz Trucks GLS63 AMG, especially if the SUV has aftermarket wheels, altered suspension height, spacers, or body changes. Since this model already uses large 21-inch and 22-inch wheel packages, small setup differences can have a noticeable effect.
A modified vehicle should be checked more carefully before replacing tires. Confirm wheel diameter first, then inspect wheel width, inner clearance, outer fender space, and steering travel. Looking for previous rubbing marks is also helpful. Those checks matter more than the model name alone when a GLS63 AMG no longer has its original configuration.
What should I inspect before driving a 2019 Mercedes-Benz Trucks GLS63 AMG on new tires?
Before driving a 2019 Mercedes-Benz Trucks GLS63 AMG on new tires, inspect the wheels for damage, confirm the tire size matches the wheel diameter, and look over the suspension and steering components for obvious wear. Tire pressure should also be set correctly and rechecked after the first period of use.
A closer walk-around is worthwhile on any high-performance SUV that may have sat unused or seen previous modifications. Check for clearance at full steering lock, make sure there are no signs of contact with liners or suspension parts, and watch for vibration or air loss during early use. Catching those issues quickly helps protect the new tires.
How often should tires on a 2019 Mercedes-Benz Trucks GLS63 AMG be inspected?
Tires on a 2019 Mercedes-Benz Trucks GLS63 AMG should be inspected regularly, not just when tread looks low. A quick visual check before driving and a more thorough inspection at routine service intervals helps catch cracking, cuts, bulges, uneven wear, or pressure loss before those issues become more serious.
Performance-oriented SUVs can be especially sensitive to alignment, wheel damage, and changes in suspension condition, so consistent inspection is worthwhile. Vehicles that are driven infrequently still deserve attention because age and storage conditions affect tire health. Looking over the sidewalls, tread surface, and inflation condition is a smart habit before longer trips.
