The 2017 Mercedes-Benz Trucks GLS350d sits in the modern full-size luxury SUV class, where quiet road manners, long-distance comfort, and substantial curb presence all shape the driving experience. On a vehicle like this, tire selection is tied as much to wheel setup as it is to appearance or brand preference. The 2017 Mercedes-Benz Trucks GLS350d uses radial tires in two fitments, 275/55R19 and 275/50R20, both with a similar overall diameter but different rim diameters. That makes wheel confirmation the first step before comparing tire choices. Once the correct wheel size is verified, the focus shifts to selecting the right radial fitment for the vehicle's actual setup and intended road use.
Which Tire Size Is Right for The 2017 Mercedes-Benz Trucks GLS350d
The 2017 Mercedes-Benz Trucks GLS350d uses two primary tire sizes, and the difference comes down first to wheel diameter. Both sizes are radial fitments with very similar overall dimensions, but one is built for a 19-inch rim and the other for a 20-inch rim. Before choosing a tire, confirm which wheel package is actually on the vehicle, since the GLS350d 4Matic can use either size.
The size 275/50R20 identifies a metric radial tire with a 275-millimeter nominal section width, a 50-series aspect ratio, radial construction, and a 20-inch rim diameter. On the 2017 Mercedes-Benz Trucks GLS350d, this size belongs to the larger wheel setup and keeps the vehicle in a modern radial format consistent with its luxury SUV character. The lower-profile sidewall compared with the 19-inch fitment changes the tire's visual proportion while staying close in overall diameter. This is the size to evaluate when the vehicle is equipped with 20-inch wheels and you want to preserve that wheel-and-tire relationship.
The size 275/55R19 is a metric radial tire that uses a 275-millimeter nominal section width, a 55-series aspect ratio, radial construction, and a 19-inch rim diameter. For the 2017 Mercedes-Benz Trucks GLS350d, this fitment serves the 19-inch wheel configuration while remaining very close in overall diameter to the 20-inch option. Its slightly taller sidewall changes the look and wheel-to-tire balance without turning into a different sizing system. This is the correct size to consider when the vehicle is running 19-inch wheels and you want to match that specific rim diameter.
Fitment is straightforward here because the covered sub-model uses the same two tire sizes found at the model level. The key step is not choosing between trims, but confirming whether the vehicle is on 19-inch or 20-inch wheels before selecting tires.
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2017 Mercedes-Benz Trucks GLS350d 4Matic
The 2017 Mercedes-Benz Trucks GLS350d 4Matic can use either of the two radial fitments used on this model, depending on its wheel setup. Tire selection starts with verifying the actual rim diameter on the vehicle, then choosing the matching metric radial size for proper wheel compatibility.
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
Tire questions for the 2017 Mercedes-Benz Trucks GLS350d usually come down to wheel diameter, the difference between 275/55R19 and 275/50R20, and what to inspect before putting a heavy luxury SUV back on the road.
Tire Size & Fitment
What tire size fits a 2017 Mercedes-Benz Trucks GLS350d?
The 2017 Mercedes-Benz Trucks GLS350d uses two tire sizes: 275/55R19 and 275/50R20. Both are radial metric sizes, and both are correct primary fitments for this model depending on the wheel package installed on the vehicle.
The practical difference is rim diameter, not a completely different tire family. A 275/55R19 belongs on a 19-inch wheel, while a 275/50R20 belongs on a 20-inch wheel. Checking the actual wheel size on the vehicle is the first step before replacing tires, especially if the SUV has had wheel changes since new.
What size rim does a 2017 Mercedes-Benz Trucks GLS350d use?
A 2017 Mercedes-Benz Trucks GLS350d can use either a 19-inch or 20-inch rim, depending on which of its two tire sizes is on the vehicle. The 275/55R19 size uses a 19-inch rim, and the 275/50R20 size uses a 20-inch rim.
That makes rim confirmation more important than simply matching section width. Both tire sizes are 275 millimeters wide, so it is easy to focus on the first number and miss the wheel diameter. Reading the tire sidewall and measuring the wheel setup already on the GLS350d helps prevent ordering a tire that matches the width but not the rim.
Why does the 2017 Mercedes-Benz Trucks GLS350d have more than one tire size?
The 2017 Mercedes-Benz Trucks GLS350d has more than one tire size because it was fitted with more than one wheel diameter. The two sizes, 275/55R19 and 275/50R20, keep a similar overall tire height while pairing with different rims.
That kind of fitment variation is common when a vehicle can be equipped with different wheel packages. For replacement purposes, the decision is not which size sounds closest, but which size matches the wheels actually on the SUV. Verifying the wheel diameter first keeps the replacement tire aligned with the vehicle's current setup and clearance.
Choosing the Right Tire
What should I consider when choosing a tire for a 2017 Mercedes-Benz Trucks GLS350d?
Start with the correct primary size for the wheel package already on the vehicle: either 275/55R19 or 275/50R20. Both are metric radial sizes, so the main selection factor is not construction type, but making sure the tire matches the wheel diameter and intended use of the SUV.
After size is confirmed, compare the tire's overall suitability for a heavy luxury SUV that may see daily road use, highway travel, or mixed family driving. Wheel condition, suspension wear, and any prior wheel changes should also be checked. Getting the basic fitment right matters more than chasing cosmetic similarity between the two available sizes.
How do I choose between 275/55R19 and 275/50R20 tires for a 2017 Mercedes-Benz Trucks GLS350d?
Choose between 275/55R19 and 275/50R20 by matching the tire to the wheel diameter on the vehicle. The 275/55R19 size is for a 19-inch rim, while the 275/50R20 size is for a 20-inch rim. Both remain in the same metric radial format.
The two sizes are close in overall diameter, but they are not interchangeable across different wheel diameters. A quick look at the current tire sidewall or wheel measurement usually settles the question. If the GLS350d has been modified with aftermarket wheels, confirm the actual setup rather than relying only on model-level assumptions.
What rim-fitment details matter when choosing tires for a 2017 Mercedes-Benz Trucks GLS350d?
The most important rim-fitment detail is diameter. A 2017 Mercedes-Benz Trucks GLS350d using 275/55R19 requires a 19-inch rim, while a GLS350d using 275/50R20 requires a 20-inch rim. The tires share the same 275-millimeter nominal width, but they do not use the same wheel diameter.
Beyond diameter, it is worth confirming the wheel's condition and any changes from the original setup before mounting new tires. Bent wheels, nonstandard aftermarket rims, or suspension changes can affect how a replacement tire sits and clears. On a large SUV, careful wheel verification helps avoid vibration, clearance, and mounting issues.
Restoration & Appearance
Does correct tire fitment matter for a 2017 Mercedes-Benz Trucks GLS350d restoration or preservation project?
Yes. Correct tire fitment still matters on a 2017 Mercedes-Benz Trucks GLS350d, even though it is a modern vehicle rather than a vintage restoration candidate. Staying with the proper 275/55R19 or 275/50R20 size preserves the intended relationship between the tire, the wheel, and the SUV's stance.
For a preservation-minded owner, the first goal is matching the vehicle's actual wheel package rather than forcing a different size that only seems close. If appearance is important, sidewall proportion and wheel-to-tire balance matter as much as the printed size itself. That makes careful size confirmation part of keeping the SUV visually and mechanically consistent.
How does tire sizing affect the appearance of a 2017 Mercedes-Benz Trucks GLS350d?
Tire sizing has a visible effect on a 2017 Mercedes-Benz Trucks GLS350d because the model uses either a 19-inch or 20-inch wheel with a closely matched radial tire. The 275/55R19 setup places more sidewall around the wheel, while the 275/50R20 setup gives the wheel a larger visual presence.
That difference matters when trying to maintain the vehicle's intended look after a tire replacement. Even though the two sizes are close in overall height, the wheel-to-sidewall proportion changes the presentation. Matching the tire to the existing rim size helps preserve the GLS350d's visual balance instead of creating a mismatched stance.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2017 Mercedes-Benz Trucks GLS350d?
Yes. Modifications can affect tire fitment on a 2017 Mercedes-Benz Trucks GLS350d, especially if the SUV has aftermarket wheels, suspension changes, or altered ride height. Even when using one of the correct primary sizes, changes to the wheel setup can alter how the tire sits in relation to the body and suspension.
A GLS350d that no longer has its original wheel package should be checked for actual rim diameter, width, and clearance before replacement tires are chosen. Steering travel and fender space matter just as much as the printed size. Verifying the current setup avoids assuming that every modified vehicle still matches standard model-level fitment.
What should I inspect before driving a 2017 Mercedes-Benz Trucks GLS350d on new tires?
Before driving a 2017 Mercedes-Benz Trucks GLS350d on new tires, inspect wheel condition, valve stems, inflation pressure, and basic suspension condition. It is also smart to confirm that all four tires match the intended size for the wheel package, either 275/55R19 or 275/50R20.
A large luxury SUV places real demands on its tires, so a visual check should include clearance at full steering lock and any signs of rubbing or uneven seating on the rim. After the first miles, recheck pressure and watch for vibration or pull. Those simple steps help catch fitment or installation issues early.
What should I check before a longer drive in a 2017 Mercedes-Benz Trucks GLS350d?
Before a longer drive in a 2017 Mercedes-Benz Trucks GLS350d, check tire pressure, tread condition, and the sidewalls for cuts, bulges, or age-related cracking. Confirm that the SUV is running the correct tire size for its wheels and that there is no unusual wear pattern suggesting alignment or suspension problems.
Longer highway use puts sustained load and heat into the tires, so condition matters more than appearance alone. A vehicle that sits for stretches should also be checked for slow air loss or flat spotting before departure. Spending a few minutes on inspection is especially worthwhile on a heavy SUV that may carry passengers and cargo.
