The 2018 Mercedes-Benz Trucks GLC63 AMG brings modern AMG performance into a high-powered SUV format, blending luxury utility with the kind of tire demands that come with a staggered setup. On this vehicle, tire selection starts with confirming whether the front or rear position is being replaced, and whether it is running the 20-inch or 21-inch wheel package. All four primary sizes are radial metric fitments, so the real decision centers on exact axle position, wheel diameter, and the intended balance between appearance and road use. Getting that combination right matters more here than simply matching a brand name.
Which Tire Size Is Right for The 2018 Mercedes-Benz Trucks GLC63 AMG
The 2018 Mercedes-Benz Trucks GLC63 AMG uses four primary tire sizes, and they are split by both axle position and wheel diameter. Front fitment differs from rear fitment, and 20-inch and 21-inch wheel packages use different sizes, so the first step is confirming whether you are replacing a front or rear tire and which rim diameter is on the vehicle.
The size 265/40R21 identifies a metric radial tire with a 265 millimeter section width, a 40-series aspect ratio, and a 21-inch rim diameter. On the 2018 Mercedes-Benz Trucks GLC63 AMG, this is a front-axle size used with the 21-inch wheel setup, so it should be matched to the correct axle and wheel diameter rather than treated as a universal fitment. Its role in the staggered arrangement makes careful size matching especially important. Use this size when the vehicle is equipped with 21-inch front wheels and the existing setup confirms this fitment.
The size 265/45R20 is a metric radial format, meaning 265 millimeters of nominal section width, a 45-series profile, and fitment on a 20-inch rim. For the 2018 Mercedes-Benz Trucks GLC63 AMG, this size serves the front axle on vehicles using the 20-inch wheel package, making wheel-diameter confirmation essential before replacement. It fills the same front-position role as the 21-inch front size, but on a different wheel package. Choose this size only after verifying that the vehicle is running 20-inch front wheels and has not been changed to an alternate setup.
The code 295/35R21 describes a metric radial tire with a wider 295 millimeter section width, a 35-series profile, and a 21-inch rim diameter. On the 2018 Mercedes-Benz Trucks GLC63 AMG, this is a rear-axle fitment used with the 21-inch staggered setup, so it is paired with a narrower front size rather than used at all four corners. That wider rear sizing is a key part of the vehicle's fitment pattern. This is the size to evaluate when replacing rear tires on a GLC63 AMG equipped with 21-inch wheels.
The size 295/40R20 is a metric radial tire that combines a 295 millimeter section width with a 40-series profile for a 20-inch rim. It is the rear size for 2018 Mercedes-Benz Trucks GLC63 AMG models using the 20-inch wheel package, and it should be selected only for the rear position on that setup. Available product choice in this size includes the Nitto NT555 G2 in a blackwall radial design. Confirming rear axle placement, wheel diameter, and the vehicle's current wheel package is the practical step before moving ahead with this size.
Fitment on the 2018 Mercedes-Benz Trucks GLC63 AMG is straightforward once axle position is identified, because the front and rear use different tire sizes. Checking whether you are replacing a front or rear tire matters just as much as confirming whether the vehicle has 20-inch or 21-inch wheels.
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2018 Mercedes-Benz Trucks GLC63 AMG 4Matic Front
The 2018 Mercedes-Benz Trucks GLC63 AMG 4Matic Front uses the narrower front tire sizes in this staggered radial setup, with one size tied to the 20-inch package and the other to the 21-inch package. Tire selection here starts with wheel-diameter confirmation so the front axle retains the intended fitment balance.
The 2018 Mercedes-Benz Trucks GLC63 AMG 4Matic Rear uses the wider rear tire sizes, again split between 20-inch and 21-inch wheel diameters. That means rear replacement should focus on matching the existing wheel package and preserving the staggered front-to-rear sizing relationship.
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.
Best 2018 Mercedes-Benz Trucks GLC63 AMG Tires for Sale
Current product selection for the 2018 Mercedes-Benz Trucks GLC63 AMG includes a 295/40R20 rear tire from Nitto. That option is a blackwall radial in the NT555 G2 series, giving buyers a clear rear-position comparison point within the 20-inch wheel setup.
These FAQs focus on the staggered tire sizing used on the 2018 Mercedes-Benz Trucks GLC63 AMG, including front-versus-rear fitment, 20-inch versus 21-inch wheel packages, product selection, and practical checks before road use.
Tire Size & Fitment
What tire size fits a 2018 Mercedes-Benz Trucks GLC63 AMG?
The 2018 Mercedes-Benz Trucks GLC63 AMG uses four primary tire sizes: 265/45R20 and 265/40R21 on the front, plus 295/40R20 and 295/35R21 on the rear. All of these are radial metric sizes, and they are tied to a staggered fitment layout rather than a same-size arrangement at all four corners.
Choosing the right one starts with identifying both axle position and wheel diameter. A front tire should be matched to the front size, a rear tire to the rear size, and the 20-inch and 21-inch packages should not be mixed casually without checking the full wheel and tire setup on the vehicle.
What size rim does a 2018 Mercedes-Benz Trucks GLC63 AMG use?
The 2018 Mercedes-Benz Trucks GLC63 AMG uses either 20-inch or 21-inch rims, depending on the wheel package on the vehicle. The 265/45R20 and 295/40R20 sizes belong to the 20-inch setup, while the 265/40R21 and 295/35R21 sizes belong to the 21-inch setup.
That makes wheel-diameter confirmation one of the first things to check before replacing tires. Looking only at the vehicle year and model is not enough here, because the same GLC63 AMG can be fitted with different rim diameters and a staggered front-to-rear arrangement that must stay properly matched.
Why does the 2018 Mercedes-Benz Trucks GLC63 AMG have more than one tire size?
The 2018 Mercedes-Benz Trucks GLC63 AMG has more than one tire size because it uses a staggered fitment, with narrower tires on the front and wider tires on the rear. It also appears with two wheel-diameter packages, so each axle has one size for 20-inch wheels and another for 21-inch wheels.
That combination means there is no single universal tire size for every GLC63 AMG. Replacing tires correctly depends on knowing whether the tire is for the front or rear and verifying the wheel diameter already on the vehicle, especially if the wheels may have been changed from the original setup.
Choosing the Right Tire
What should I consider when choosing a tire for a 2018 Mercedes-Benz Trucks GLC63 AMG?
Start with the basics: front or rear position, 20-inch or 21-inch wheel diameter, and the exact tire size already fitted to that corner of the vehicle. The 2018 Mercedes-Benz Trucks GLC63 AMG uses a staggered radial layout, so matching the correct size to the correct axle is the first requirement.
Once the fitment is confirmed, compare the available tire's series, construction details, and intended use. A rear tire such as the 295/40R20 option should also be checked against the wheel setup currently on the vehicle, especially if aftermarket wheels or suspension changes could affect width, clearance, or overall fitment balance.
What sidewall styles are available for 2018 Mercedes-Benz Trucks GLC63 AMG tires?
Available sidewall treatment for the current 2018 Mercedes-Benz Trucks GLC63 AMG product selection includes a blackwall design. The visible product offering in 295/40R20 uses that blackwall presentation, which suits a modern, performance-oriented look rather than a vintage or restoration-style appearance.
Sidewall style is still worth checking because it affects how the tire looks on the vehicle even when the size is correct. For a modern AMG SUV, the practical priority remains exact fitment by axle position and wheel diameter, with sidewall appearance becoming a secondary choice after the correct size is confirmed.
What brands offer tires for the 2018 Mercedes-Benz Trucks GLC63 AMG?
The currently represented brand for this fitment is Nitto, with a 295/40R20 rear tire offered in the NT555 G2 series. That gives buyers a defined option in one of the GLC63 AMG rear sizes rather than a broad mix of brands spread across every front and rear fitment.
Brand should be considered alongside exact size, wheel diameter, and axle position instead of as a stand-alone decision. On a staggered vehicle like this one, the more important question is whether the specific tire matches the corner being replaced and the wheel package currently installed on the SUV.
Restoration & Appearance
How does tire construction affect the appearance of a restored 2018 Mercedes-Benz Trucks GLC63 AMG?
On a 2018 Mercedes-Benz Trucks GLC63 AMG, construction does not create a bias-ply versus radial appearance decision because the primary fitments are radial sizes throughout. Visual character comes more from the wheel diameter, the staggered front-and-rear stance, and the sidewall treatment than from choosing between older and newer construction types.
Appearance-minded owners should focus on preserving the intended front-to-rear proportion by keeping the correct axle-specific sizes in place. Even on a modern collector vehicle, a mismatched rear size or the wrong wheel diameter can change the visual balance quickly, so fitment discipline matters just as much as cosmetic preference.
Does correct tire fitment matter for a 2018 Mercedes-Benz Trucks GLC63 AMG restoration?
Correct tire fitment matters because the 2018 Mercedes-Benz Trucks GLC63 AMG relies on a staggered setup with specific front and rear sizes tied to 20-inch or 21-inch wheels. Keeping those relationships intact helps maintain the vehicle's intended stance, wheel-fill, and overall presentation during a restoration or collector-level refresh.
Owners aiming for a clean, authentic-looking result should verify what wheel package is actually on the vehicle before ordering tires. If originality questions go beyond size and wheel diameter, marque-specific records and vehicle history are the right places to confirm how a particular example was equipped when new.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Mercedes-Benz Trucks GLC63 AMG?
Yes, modifications can affect tire fitment on a 2018 Mercedes-Benz Trucks GLC63 AMG. Changes such as aftermarket wheels, altered wheel widths, suspension lowering, or body modifications can change how the front 265-section and rear 295-section tires sit in the wheel openings and how much clearance they have in use.
A modified vehicle should be checked corner by corner before replacement tires are chosen. Confirm the actual wheel diameter, verify whether the staggered setup has been retained, and inspect steering and fender clearance so the replacement size matches the current configuration rather than only the original vehicle designation.
What should I inspect before driving a 2018 Mercedes-Benz Trucks GLC63 AMG on new tires?
Before driving on new tires, check that each tire is mounted in the correct front or rear position and that the wheel diameter matches the installed size. It is also smart to inspect inflation pressure, wheel condition, visible sidewall damage, and whether the tires clear suspension and body components through normal steering and suspension movement.
A short initial road check helps confirm that the staggered setup feels consistent and that nothing rubs under load or during turns. Any recently mounted tire should also be rechecked for air loss and general seating after the first drives, especially on a high-performance SUV with wide rear fitment.
What should I check before a longer drive in a 2018 Mercedes-Benz Trucks GLC63 AMG?
Before a longer drive, make sure the 2018 Mercedes-Benz Trucks GLC63 AMG has the correct tires on the correct axles, with matching wheel diameters side to side. Inspect tread condition, look for cuts, bulges, or cracking, and verify that inflation pressures are set properly for the tires currently installed on the vehicle.
Longer trips put more emphasis on consistency and condition than a short local drive. It is worth checking for slow air loss, confirming that recent wheel or suspension changes have not created clearance issues, and giving the spare or emergency support equipment a quick review before heading out.
