The 2019 Mercedes-Benz Trucks GLC63 AMG S blends compact luxury SUV packaging with the kind of high-output AMG performance that puts real demands on chassis setup and tire selection. On this model, tire fitment is not a one-size decision because the front and rear positions use different staggered sizes, and wheel diameter changes the exact combination as well. The primary fitments are all modern metric radial sizes, split between 20-inch and 21-inch wheel packages. That makes the key decision less about vintage construction choices and more about confirming front versus rear sizing, matching the wheel diameter already on the vehicle, and selecting a tire that suits both road use and the vehicle's performance character.
Which Tire Size Is Right for The 2019 Mercedes-Benz Trucks GLC63 AMG S
The 2019 Mercedes-Benz Trucks GLC63 AMG S uses four primary tire sizes across a staggered front-and-rear setup, with fitment split between 20-inch and 21-inch wheels. Before selecting a tire, the first step is confirming both the wheel diameter on the vehicle and whether you are replacing a front or rear tire, since the sizes are position-specific rather than interchangeable across the whole vehicle.
In 265/40R21, the 265 is the nominal section width in millimeters, 40 is the aspect ratio, R identifies radial construction, and 21 is the wheel diameter in inches. On the 2019 Mercedes-Benz Trucks GLC63 AMG S, this is a front fitment used with the 21-inch staggered setup, so it needs to be matched to the correct axle position. Its modern metric radial format suits the vehicle's late-model performance character. This size is the one to evaluate when the vehicle carries 21-inch front wheels and you want to preserve the intended staggered relationship with the rear tires.
The 265/45R20 size uses the same 265-millimeter nominal width as the 21-inch front fitment, but with a 45-series profile on a 20-inch wheel. It is also a front tire size for the 2019 Mercedes-Benz Trucks GLC63 AMG S, paired with the 20-inch staggered wheel package rather than the 21-inch setup. As a modern radial size, it reflects contemporary high-performance fitment practice rather than vintage sizing conventions. This is the front size to confirm when the vehicle has 20-inch wheels and you need to keep the front-to-rear diameter and width relationship aligned with the matching rear tire.
A 295/35R21 tire has a 295-millimeter nominal section width, a 35-series profile, radial construction, and fits a 21-inch wheel. On the 2019 Mercedes-Benz Trucks GLC63 AMG S, this is the rear size used with the 21-inch staggered arrangement, giving the rear axle a wider tire than the front. That wider rear sizing is an important part of the vehicle's overall fitment balance, so it should be matched carefully by wheel diameter and position. Choose this size only when replacing the rear tires on a vehicle equipped with the 21-inch package.
The 295/40R20 size pairs a 295-millimeter nominal width with a 40-series profile on a 20-inch rim, and it is the rear fitment for the 20-inch staggered setup. This is the one applicable size in this fitment range with a currently available product option, represented by the Nitto NT555 G2 in blackwall form. Its radial construction and performance-oriented series make it especially relevant for owners replacing rear tires on vehicles already running 20-inch wheels. It should be evaluated as a rear-only size, with attention to matching the corresponding 20-inch front setup rather than mixing wheel-package configurations.
2019 Mercedes-Benz Trucks GLC63 AMG S Sub-Model Tires
Fitment on the 2019 Mercedes-Benz Trucks GLC63 AMG S is straightforward once the tire position is identified, because the covered sub-models separate the front and rear sizes rather than representing different trim packages. Checking the exact front or rear application matters first, and wheel diameter matters second because both 20-inch and 21-inch staggered setups are used.
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2019 Mercedes-Benz Trucks GLC63 AMG S 4Matic Front
The 2019 Mercedes-Benz Trucks GLC63 AMG S 4Matic Front uses one of two radial front sizes depending on whether the vehicle has 20-inch or 21-inch wheels. Tire selection here starts with confirming the wheel diameter already on the vehicle so the front axle stays properly matched to its corresponding rear fitment.
The 2019 Mercedes-Benz Trucks GLC63 AMG S 4Matic Rear uses the wider rear half of the staggered setup, again split between 20-inch and 21-inch wheel packages. Rear tire selection should preserve the correct size for the wheel diameter in use and avoid mixing rear fitments from one package with front tires from the other.
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 2019 Mercedes-Benz Trucks GLC63 AMG S Tires for Sale
Available product selection within this fitment centers on the 295/40R20 rear size, where Nitto offers a radial blackwall option in the NT555 G2 series. That makes axle position and wheel diameter the main comparison points before looking at individual product specifications.
Owners of the 2019 Mercedes-Benz Trucks GLC63 AMG S usually need clarity on staggered tire sizing, 20-inch versus 21-inch wheel fitment, front-to-rear differences, and how to choose the right radial tire for performance use and routine road service.
Tire Size & Fitment
What tire size fits a 2019 Mercedes-Benz Trucks GLC63 AMG S?
The 2019 Mercedes-Benz Trucks GLC63 AMG S uses a staggered radial setup with four primary sizes: 265/45R20 and 265/40R21 at the front, plus 295/40R20 and 295/35R21 at the rear. The exact combination depends on whether the vehicle has the 20-inch or 21-inch wheel package.
That means tire selection starts with two checks, not one. First confirm whether you are replacing a front or rear tire, then verify the wheel diameter already on the vehicle. Mixing a 20-inch fitment with a 21-inch setup, or confusing a front size with a rear size, can disrupt the intended staggered arrangement.
What size rim does a 2019 Mercedes-Benz Trucks GLC63 AMG S use?
The 2019 Mercedes-Benz Trucks GLC63 AMG S uses either 20-inch or 21-inch rims, depending on the wheel package on the vehicle. The 265/45R20 front and 295/40R20 rear pair with 20-inch rims, while the 265/40R21 front and 295/35R21 rear pair with 21-inch rims.
Rim diameter is the first hard fitment point to confirm before shopping for replacement tires. A tire built for a 20-inch rim cannot be mounted on a 21-inch wheel, and the front and rear positions still need to remain matched as a proper staggered set once the rim diameter has been verified.
Why does the 2019 Mercedes-Benz Trucks GLC63 AMG S have more than one tire size?
More than one tire size applies because the 2019 Mercedes-Benz Trucks GLC63 AMG S uses a staggered setup, with narrower tires at the front and wider tires at the rear. It also appears with either a 20-inch or 21-inch wheel package, creating two front sizes and two rear sizes.
That does not mean any of the four sizes can be used anywhere on the vehicle. The important step is identifying the wheel diameter and axle position already in service. Once those are confirmed, the correct tire choice becomes much narrower and easier to match to the vehicle's existing setup.
Choosing the Right Tire
What should I consider when choosing a 295/40R20 tire for a 2019 Mercedes-Benz Trucks GLC63 AMG S?
Start with the basics: 295/40R20 is a rear tire size for the 20-inch staggered setup on the 2019 Mercedes-Benz Trucks GLC63 AMG S. The key points are correct axle position, radial construction, and compatibility with the wheel diameter already on the vehicle.
From there, compare the tire's intended character and specifications rather than looking at size alone. The available option in this fitment is a Nitto NT555 G2 blackwall radial, so buyers should confirm that the rear wheel setup, the matching 20-inch front tire size, and the vehicle's actual use all align before making a selection.
What sidewall styles are available for 2019 Mercedes-Benz Trucks GLC63 AMG S tires?
The available product option in this fitment range uses a blackwall sidewall style. On a late-model high-performance SUV such as the 2019 Mercedes-Benz Trucks GLC63 AMG S, blackwall presentation keeps the focus on the wheel-and-tire package without adding a vintage or restoration-oriented sidewall treatment.
Sidewall style affects appearance more than core fitment, but it still matters visually on a staggered AMG application. Once the correct size and wheel diameter are confirmed, the remaining decision is whether the available sidewall treatment suits the vehicle's overall look and the owner's preferences for a contemporary performance presentation.
What brands offer tires for the 2019 Mercedes-Benz Trucks GLC63 AMG S?
Within the available fitment selection here, Nitto is represented for the 2019 Mercedes-Benz Trucks GLC63 AMG S. The current product option applies to the 295/40R20 rear size and appears in the NT555 G2 series with radial construction and a blackwall sidewall.
Brand should be considered alongside the exact fitment details, not ahead of them. On this vehicle, wheel diameter and front-versus-rear position are the real starting points. After those are verified, comparing the brand, tire series, and product specifications becomes much more meaningful and helps narrow the right rear tire choice.
Restoration & Appearance
Does correct tire fitment matter for a 2019 Mercedes-Benz Trucks GLC63 AMG S restoration?
Yes. Even on a newer performance SUV, correct tire fitment matters because the 2019 Mercedes-Benz Trucks GLC63 AMG S uses a staggered layout with different front and rear sizes, plus two possible wheel diameters. Preserving the proper relationship between those sizes is part of maintaining the vehicle's intended stance and presentation.
Appearance and fitment work together here more than on a single-size setup. A mismatched wheel diameter, incorrect rear width, or mixed package combination can look visibly out of place. For owners aiming to keep the vehicle true to its original character, the safest approach is confirming the existing wheel package before replacing any tire.
How does tire construction affect the appearance of a restored 2019 Mercedes-Benz Trucks GLC63 AMG S?
Tire construction is less of a visual dividing line on the 2019 Mercedes-Benz Trucks GLC63 AMG S than it is on an older collector vehicle, because its primary fitments are already modern radial sizes. The stronger appearance factors are the staggered width relationship, the 20-inch versus 21-inch wheel package, and the sidewall presentation.
That makes a correct modern radial fitment more important than trying to mimic an earlier style. Keeping the proper front and rear proportions preserves the vehicle's intended look, while the sidewall style refines the final presentation. A blackwall tire generally suits the late-model AMG character better than a more traditional sidewall treatment.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 Mercedes-Benz Trucks GLC63 AMG S?
Yes. Modifications can affect tire fitment on a 2019 Mercedes-Benz Trucks GLC63 AMG S, especially because the vehicle already uses a staggered setup with position-specific sizing. Changes such as aftermarket wheels, altered offsets, suspension lowering, or spacer use can affect clearance at the fenders, steering components, and suspension.
A vehicle with modifications should be checked as an individual setup rather than treated like a stock replacement job. Confirm wheel diameter, width, and actual tire-to-body clearance before changing sizes or replacing only one axle. That is particularly important when the vehicle has been moved away from its original 20-inch or 21-inch package.
What should I inspect before driving a 2019 Mercedes-Benz Trucks GLC63 AMG S on new tires?
Before road use, inspect the tires for proper inflation, bead seating, visible damage, and correct front-versus-rear placement. On a 2019 Mercedes-Benz Trucks GLC63 AMG S, it is especially important to confirm that the front axle carries the 265-width fitment and the rear axle carries the 295-width fitment in the correct wheel diameter.
A quick check of wheel condition and surrounding clearance is also worthwhile before the first drive. Look for rubbing marks, contact near suspension parts, and any sign that the vehicle has an unusual wheel or ride-height setup. A staggered performance vehicle benefits from catching those issues in the garage instead of on the road.
How often should tires on a 2019 Mercedes-Benz Trucks GLC63 AMG S be inspected?
Tires on a 2019 Mercedes-Benz Trucks GLC63 AMG S should be inspected regularly, with a close look before longer trips and periodic checks during routine service intervals. Pay attention to tread wear, cuts, bulges, air loss, and any uneven wear pattern that may appear differently between the front and rear positions.
Because this model uses staggered sizing, inspections should also confirm that replacement history has not introduced mismatched wheel-package tires. Catching an incorrect 20-inch or 21-inch pairing early prevents bigger fitment problems later. Regular pressure checks and visual inspections are simple habits that help preserve both tire life and road manners.
