The 2019 Mercedes-Benz Trucks GLS450 sits in the modern full-size luxury SUV class, where comfort, highway composure, and all-weather capability matter just as much as curb presence. For owners, tire choice is less about vintage-style construction and more about matching the vehicle’s wheel setup and maintaining the right balance of ride quality and fitment. This GLS450 uses radial tires in two primary sizes, 275/55R19 and 275/50R20, depending on the wheel package on the vehicle. The decision centers on confirming whether your SUV has 19-inch or 20-inch wheels, then choosing the tire that suits your driving priorities and overall presentation.
Which Tire Size Is Right for The 2019 Mercedes-Benz Trucks GLS450
The 2019 Mercedes-Benz Trucks GLS450 uses two primary tire sizes, and the correct choice depends first on wheel diameter. Both are radial metric sizes, but one fits a 19-inch rim and the other fits a 20-inch rim. Before selecting a tire, confirm which wheel package is actually on the vehicle, since the tire size follows the rim diameter rather than being an interchangeable styling choice.
The size 275/50R20 is a metric radial designation: 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 2019 Mercedes-Benz Trucks GLS450, this size is tied to a 20-inch wheel setup and gives the vehicle a lower-profile tire than the 19-inch alternative. That makes wheel confirmation especially important before purchase. Choose this size when the GLS450 is already equipped with 20-inch rims and clearance remains consistent with the current setup.
The size 275/55R19 follows the same metric radial format, with a 275-millimeter nominal section width, a 55-series profile, radial construction, and a 19-inch rim diameter. On the 2019 Mercedes-Benz Trucks GLS450, this size belongs to the 19-inch wheel configuration rather than the 20-inch package. Its dimensions are close in overall diameter to the 20-inch option, but the tire still must match the wheel itself. This is the correct size to evaluate when the vehicle is fitted with 19-inch rims and you want to preserve the intended fitment relationship.
The covered sub-model fitment is straightforward in one way and important in another: the GLS450 4Matic can use either of the two primary tire sizes. Tire choice still depends on identifying the wheel diameter on the vehicle, since 19-inch and 20-inch setups require different tires.
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2019 Mercedes-Benz Trucks GLS450 4Matic
The 2019 Mercedes-Benz Trucks GLS450 4Matic uses radial tires and may be equipped with either the 19-inch or 20-inch fitment. That means tire selection starts with checking the actual wheel diameter on the SUV, then choosing the matching metric radial size for proper mounting and fitment.
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
These FAQs focus on the two tire sizes used on the 2019 Mercedes-Benz Trucks GLS450, how to confirm the correct rim fitment, and what to check before replacing tires on a full-size luxury SUV.
Tire Size & Fitment
What tire size fits a 2019 Mercedes-Benz Trucks GLS450?
The 2019 Mercedes-Benz Trucks GLS450 uses two primary tire sizes: 275/55R19 and 275/50R20. Both are radial metric sizes, and both are used on the GLS450 4Matic depending on the wheel package installed on the vehicle.
The key step is confirming whether the SUV has 19-inch or 20-inch wheels before selecting tires. Even though the two sizes are close in overall diameter, each tire is built for a different rim diameter, so the correct choice follows the wheel that is actually on the vehicle.
What size rim does a 2019 Mercedes-Benz Trucks GLS450 use?
A 2019 Mercedes-Benz Trucks GLS450 may use either a 19-inch rim or a 20-inch rim. The 275/55R19 tire fits the 19-inch wheel setup, while the 275/50R20 tire fits the 20-inch wheel setup.
Checking the rim size on the vehicle is more important than assuming one tire size fits all GLS450 models. Looking at the existing tire sidewall, the wheel stamping, or the current wheel package can help confirm the correct diameter before replacing a single tire or a full set.
Why does the 2019 Mercedes-Benz Trucks GLS450 have more than one tire size?
The 2019 Mercedes-Benz Trucks GLS450 has more than one tire size because it was fitted with different wheel diameters. One setup uses 275/55R19 on a 19-inch rim, while the other uses 275/50R20 on a 20-inch rim.
This is not a case of choosing whichever size looks close enough. The correct tire depends on the wheel installed on the SUV, so the practical decision is to verify the actual rim diameter first, then match the tire size to that wheel and check that the full set remains consistent.
Choosing the Right Tire
What should I consider when choosing a 275/50R20 tire for a 2019 Mercedes-Benz Trucks GLS450?
Start by confirming that the 2019 Mercedes-Benz Trucks GLS450 is actually equipped with 20-inch wheels, since 275/50R20 is tied to that rim diameter. This size uses radial construction and belongs on the GLS450 setup designed around a 20-inch wheel.
After wheel size is confirmed, compare how the replacement tire matches the vehicle’s intended use, whether that means everyday highway driving, family hauling, or seasonal weather changes. It also helps to inspect the current tire clearance and make sure all four tires remain the same size unless the vehicle is intentionally set up otherwise.
What should I consider when choosing a 275/55R19 tire for a 2019 Mercedes-Benz Trucks GLS450?
The first consideration is wheel diameter, because 275/55R19 belongs on a 19-inch rim. On a 2019 Mercedes-Benz Trucks GLS450, this radial size is the correct fitment only when the SUV is equipped with the 19-inch wheel package.
Once the rim size is verified, focus on maintaining a consistent set and replacing tires in a way that matches how the vehicle is used. A full-size luxury SUV places importance on stable road manners, so keeping the correct size on the proper wheel and checking overall tire condition across the set is a smart approach.
How do I choose between the available tire sizes for a 2019 Mercedes-Benz Trucks GLS450?
Choosing between 275/55R19 and 275/50R20 is not a styling decision made independently of the vehicle. The correct tire size for a 2019 Mercedes-Benz Trucks GLS450 is determined by whether the SUV has 19-inch or 20-inch wheels installed.
A quick sidewall check on the current tires usually answers the question immediately. If the vehicle has been modified or fitted with different wheels, verify the actual rim diameter and inspect clearance before replacing tires, since the right size is the one that matches the wheel and overall setup already on the SUV.
Restoration & Appearance
Does correct tire fitment matter for a 2019 Mercedes-Benz Trucks GLS450?
Correct tire fitment matters on a 2019 Mercedes-Benz Trucks GLS450 because this SUV uses two different wheel diameters, each with its own matching tire size. A 19-inch wheel requires 275/55R19, while a 20-inch wheel requires 275/50R20.
Beyond basic mounting, proper size selection helps preserve the intended stance and avoids creating problems by pairing the wrong tire with the wrong rim. On a modern luxury SUV, keeping the wheel-and-tire combination matched is a key part of maintaining the vehicle’s original overall presentation and road-ready setup.
How does tire construction affect the appearance of a 2019 Mercedes-Benz Trucks GLS450?
For the 2019 Mercedes-Benz Trucks GLS450, the primary fitments are radial tires in modern metric sizes. That means the construction question is less about choosing between bias-ply and radial appearance, and more about keeping the SUV in the type of tire design intended for its wheel and chassis package.
Appearance is influenced more by the wheel diameter and tire profile than by vintage-style construction choices. A GLS450 on 275/55R19 presents a different sidewall proportion than one on 275/50R20, so preserving the correct size for the wheel package helps maintain the vehicle’s intended visual balance.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 Mercedes-Benz Trucks GLS450?
Yes, modifications can affect tire fitment on a 2019 Mercedes-Benz Trucks GLS450. Changes such as aftermarket wheels, altered wheel widths, suspension lowering, lift changes, or body modifications can all change how a 275/55R19 or 275/50R20 tire sits within the wheelwell.
Any GLS450 that no longer has its original wheel-and-suspension relationship should be checked carefully before tire replacement. Steering clearance, fender clearance, and full-lock movement matter just as much as the printed size, especially when the SUV has been changed from its stock wheel diameter or stance.
What should I inspect before driving a 2019 Mercedes-Benz Trucks GLS450 on new tires?
Before driving a 2019 Mercedes-Benz Trucks GLS450 on new tires, inspect that the size matches the wheel diameter and that all tires are mounted in the intended positions. Check inflation, verify there is no rubbing at steering lock, and make sure the wheels and lug hardware are in proper condition.
It also helps to look over the suspension and alignment condition, since worn components can affect how a new tire behaves. A short initial drive followed by another visual check for clearance, air retention, and even seating on the rim is a sensible step before returning the SUV to regular use.
How often should tires on a 2019 Mercedes-Benz Trucks GLS450 be inspected?
Tires on a 2019 Mercedes-Benz Trucks GLS450 should be inspected regularly rather than only when they look visibly worn. Frequent checks for tread condition, uneven wear, cuts, bulges, cracking, and air loss are especially worthwhile on a heavy luxury SUV that may see family, highway, and seasonal driving.
A monthly visual inspection is a practical habit, and an additional check before longer trips adds another layer of caution. Owners should also pay attention after pothole impacts or curb contact, since wheel damage or alignment changes can affect either the 275/55R19 or 275/50R20 fitment without immediate obvious symptoms.
