The 2017 Mercedes-Benz Trucks GLS450 sits in the modern full-size luxury SUV category, where ride quality, road manners, and a substantial wheel-and-tire package all play an important role in how the vehicle feels on the road. For this exact GLS450 fitment, the main tire decision starts with confirming whether the vehicle is on 19-inch or 20-inch wheels, because both 275/55R19 and 275/50R20 apply and both are radial sizes. Once wheel diameter is confirmed, the focus shifts to selecting the right tire within that size for intended road use, appearance, and overall compatibility with the vehicle's current wheel and suspension setup.
Which Tire Size Is Right for The 2017 Mercedes-Benz Trucks GLS450
The 2017 Mercedes-Benz Trucks GLS450 uses two primary tire sizes, and the correct one depends first on wheel diameter. Both sizes are radial metric fitments, but one is built for a 19-inch rim and the other for a 20-inch rim, so confirming the actual wheel on the vehicle is the first step before comparing tire choices.
275/50R20 is a metric radial size in which 275 identifies the section width in millimeters, 50 is the aspect ratio, R indicates radial construction, and 20 is the rim diameter in inches. On the 2017 Mercedes-Benz Trucks GLS450, this size belongs to vehicles equipped with 20-inch wheels rather than the alternate 19-inch setup. Its sizing format is familiar to modern SUV owners and centers the buying decision on matching the tire to the wheel already on the vehicle. This is the size to evaluate when the GLS450 currently wears 20-inch rims and clearance has not been altered by aftermarket changes.
275/55R19 is also a metric radial size, with a 275-millimeter section width, a 55-series aspect ratio, radial construction, and a 19-inch rim diameter. For the 2017 Mercedes-Benz Trucks GLS450, this fitment applies to the 19-inch wheel configuration and should be treated separately from the 20-inch option. The size code is straightforward, but the practical point is confirming the wheel diameter before assuming interchangeability. This is the correct path to follow when the vehicle remains on 19-inch wheels or when tire replacement is being matched to the existing factory-style wheel setup.
Sub-model fitment is simple here, but wheel choice still matters. The GLS450 4Matic can use either of the two radial sizes, so the key step is confirming whether the vehicle has 19-inch or 20-inch rims before selecting tires.
1
2017 Mercedes-Benz Trucks GLS450 4Matic
The 2017 Mercedes-Benz Trucks GLS450 4Matic uses radial tire fitments in either a 19-inch or 20-inch wheel configuration. Tire selection comes down to matching the vehicle's current wheel diameter first, then comparing options within that exact size for compatibility with the SUV's present 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
Owners of a 2017 Mercedes-Benz Trucks GLS450 usually need to sort out wheel diameter first, then focus on metric radial sizing, rim fitment, product selection, and practical inspection points before regular road use.
Tire Size & Fitment
What tire size fits a 2017 Mercedes-Benz Trucks GLS450?
The 2017 Mercedes-Benz Trucks GLS450 uses two primary tire sizes: 275/55R19 and 275/50R20. Both are radial metric sizes, and both apply to the GLS450, but they are tied to different wheel diameters rather than being interchangeable by default.
The real fitment decision is identifying which wheels are actually on the vehicle now. A GLS450 with 19-inch rims needs the 275/55R19 size, while a GLS450 with 20-inch rims needs 275/50R20. Checking the tire sidewall and measuring wheel diameter is the best starting point, especially if the SUV has had wheel changes at any point.
What size rim does a 2017 Mercedes-Benz Trucks GLS450 use?
A 2017 Mercedes-Benz Trucks GLS450 uses either a 19-inch or 20-inch rim, depending on the wheel setup on the vehicle. The 275/55R19 tire mounts on a 19-inch rim, while the 275/50R20 tire mounts on a 20-inch rim.
Rim diameter is the first thing to confirm because the two tire sizes are built around different wheels. Looking only at tread width can be misleading since both sizes start with 275. Before replacing tires, verify the actual wheel diameter on the vehicle and make sure any past wheel swap did not change the intended fitment.
Why does the 2017 Mercedes-Benz Trucks GLS450 have more than one tire size?
The 2017 Mercedes-Benz Trucks GLS450 has more than one tire size because it was fitted with more than one wheel diameter. Both fitments are radial and use the same nominal 275-millimeter width, but one is matched to a 19-inch wheel and the other to a 20-inch wheel.
That means the correct replacement tire is determined by the wheel currently on the SUV, not simply by the model name. Since the two sizes are close in overall dimensions, some owners assume either one can be used, but the tire still has to match the rim diameter exactly and should be checked for proper clearance and wheel compatibility.
Choosing the Right Tire
What should I consider when choosing a 275/50R20 tire for a 2017 Mercedes-Benz Trucks GLS450?
Start by confirming that the vehicle is actually equipped with 20-inch wheels, because 275/50R20 is only correct for that setup. From there, the main considerations are staying with the exact size, confirming the wheel and tire are matched properly, and choosing a tire suited to how the GLS450 is driven.
A careful replacement decision should also account for the current wheel width, the SUV's suspension condition, and any modifications that could affect clearance. Even on a modern fitment, it helps to compare the new tire against the existing setup rather than assuming every tire in the same nominal size will behave the same way once mounted.
What should I consider when choosing a 275/55R19 tire for a 2017 Mercedes-Benz Trucks GLS450?
The first step is verifying that the GLS450 is on 19-inch wheels, since 275/55R19 belongs to that configuration. After that, the focus should be on using the correct metric radial size and making sure the replacement tire matches the vehicle's intended wheel diameter and general fitment needs.
Selection also becomes easier when the tire is judged against the vehicle's present condition. Wheel changes, suspension wear, or alignment issues can affect how a new tire performs and wears. Matching the size code alone is not enough if the SUV has been altered, so it is wise to confirm wheel specs and inspect for clearance before finalizing the choice.
How do I choose between the available tire sizes for a 2017 Mercedes-Benz Trucks GLS450?
Choosing between the available sizes is not a matter of preference alone, because 275/55R19 and 275/50R20 are tied to different wheel diameters. The 2017 Mercedes-Benz Trucks GLS450 should use the size that matches the rims currently installed on the vehicle.
The easiest way to decide is to check the sidewall on the existing tires and confirm the wheel diameter directly. A vehicle with original-style wheels may still have been changed by a previous owner, so visual assumptions can be misleading. Once the correct size is confirmed, then it makes sense to compare tires within that size for road use, ride expectations, and compatibility.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2017 Mercedes-Benz Trucks GLS450?
Yes, modifications can affect tire fitment on a 2017 Mercedes-Benz Trucks GLS450 even when the tire size appears correct on paper. Aftermarket wheels, altered offsets, suspension changes, lowering, or body modifications can all change how a 275/55R19 or 275/50R20 tire sits in the wheel opening.
That is why wheel diameter alone should not be the only check. A GLS450 with non-stock wheels may need closer attention to clearance at the fender, suspension, and steering components. Tire replacement is much easier when the current wheel width and overall setup are confirmed first, especially on a used vehicle with an unknown modification history.
What should I inspect before driving a 2017 Mercedes-Benz Trucks GLS450 on new tires?
Before regular road use, inspect tire pressure, tread seating, visible sidewall condition, and overall clearance around the wheel opening and suspension. It also helps to confirm that the tire size mounted matches the wheel diameter on the vehicle, since the GLS450 uses both 19-inch and 20-inch fitments.
A short initial drive should be followed by another look for rubbing, uneven stance, or signs of contact under steering lock. Alignment condition matters as well, because a large luxury SUV can show irregular wear quickly if suspension or steering components are worn. Catching those issues early protects the new tires and helps the vehicle track properly.
How often should tires on a 2017 Mercedes-Benz Trucks GLS450 be inspected?
Tires on a 2017 Mercedes-Benz Trucks GLS450 should be inspected regularly, not just when they look worn. A routine visual check for cracking, punctures, bulges, uneven tread wear, and air loss is a good habit, especially on an SUV that may carry passengers and cover highway miles.
Inspection matters even more when the vehicle is driven infrequently or has sat for stretches of time. Low-use vehicles can still develop age-related tire issues, and improper inflation can go unnoticed between drives. Looking over the tires before longer trips and keeping pressures consistent helps preserve ride quality, tread life, and overall confidence on the road.
