The 2011 Mercedes-Benz Trucks GL450 sits in the full-size luxury SUV class, blending three-row practicality with the substantial stance and road presence buyers expect from a modern Mercedes-Benz utility vehicle. For tire selection, the key point is that this GL450 uses two different primary radial fitments depending on configuration: 275/55R19 or 275/50R20. That makes this page less about choosing between bias-ply and radial construction and more about confirming the exact wheel setup first. Once the correct size is established, the decision shifts to maintaining the intended ride, appearance, and clearance for a stock or restoration-minded truck.
Which Tire Size Is Right for The 2011 Mercedes-Benz Trucks GL450
The 2011 Mercedes-Benz Trucks GL450 uses two primary tire sizes, and the difference comes down to sub-model and wheel diameter rather than construction. Both fitments are radial, but one uses a 19-inch rim and the other a 20-inch rim, so the first step is confirming whether the truck is a Base model or a GL450 w/Appearance Pkg. and matching that to the actual wheels on the vehicle.
In 275/55R19, the 275 is the nominal section width in millimeters, the 55 is the aspect ratio, the R identifies radial construction, and the 19 is the wheel diameter in inches. This is a modern metric radial size suited to the GL450 configuration that runs on a 19-inch wheel. For this vehicle, the practical importance is confirming that the wheel diameter matches before making any tire choice. It is the right size to evaluate when the truck remains in its standard 19-inch-wheel configuration and stock-style overall proportions matter.
In 275/50R20, the 275 again refers to nominal section width in millimeters, the 50 is the aspect ratio, the R marks radial construction, and the 20 indicates a 20-inch wheel. This size belongs to the GL450 setup that uses a 20-inch rim, giving the buyer a different wheel-and-tire package rather than a different construction type. The main selection point is wheel confirmation, since rim diameter changes the fitment path immediately. It is the size to focus on when the truck carries the 20-inch appearance-package wheel setup.
Sub-model fitment matters on the 2011 Mercedes-Benz Trucks GL450 because the covered configurations do not share the same tire size. Identifying whether the truck is a Base model or a GL450 w/Appearance Pkg. is the first step before comparing tires or confirming wheel diameter.
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2011 Mercedes-Benz Trucks GL450 Base
The 2011 Mercedes-Benz Trucks GL450 Base uses the 275/55R19 radial fitment. That makes the tire decision fairly straightforward once the truck's 19-inch wheel setup is confirmed and the goal is to preserve the intended overall fit and road manners.
The 2011 Mercedes-Benz Trucks GL450 w/Appearance Pkg. uses the 275/50R20 radial fitment. Tire selection here starts with verifying the 20-inch wheel package, then choosing a replacement that maintains proper diameter relationship and clearance for that configuration.
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
Questions about the 2011 Mercedes-Benz Trucks GL450 usually center on the correct tire size by sub-model, the difference between the 19-inch and 20-inch fitments, and what to inspect before replacing tires on a large luxury SUV.
Tire Size & Fitment
What tire size fits a 2011 Mercedes-Benz Trucks GL450?
The 2011 Mercedes-Benz Trucks GL450 uses either 275/55R19 or 275/50R20, depending on configuration. The Base model uses 275/55R19, while the GL450 w/Appearance Pkg. uses 275/50R20. Both are radial tire sizes, so the fitment difference is tied to wheel package rather than a change in construction style.
The practical step is confirming the exact sub-model and checking the wheels actually installed on the truck. A GL450 that has had wheel changes over time may no longer match its original package, so sidewall markings and wheel diameter should both be verified before selecting replacement tires.
What size rim does a 2011 Mercedes-Benz Trucks GL450 use?
A 2011 Mercedes-Benz Trucks GL450 uses either a 19-inch or 20-inch rim, depending on the tire size fitted to the vehicle. The 275/55R19 setup uses a 19-inch wheel, and the 275/50R20 setup uses a 20-inch wheel. Rim diameter is built directly into the tire size code.
That makes wheel confirmation the first fitment check before comparing tires. A tire sized for a 19-inch rim cannot be mounted on a 20-inch wheel, and the reverse is also true, so the buyer should confirm the actual wheel diameter on the truck rather than relying only on model name.
Do all 2011 Mercedes-Benz Trucks GL450 sub-models use the same tire size?
No. The 2011 Mercedes-Benz Trucks GL450 Base uses 275/55R19, while the 2011 Mercedes-Benz Trucks GL450 w/Appearance Pkg. uses 275/50R20. Both are radial fitments, but they are not the same size and they do not use the same wheel diameter.
That difference matters because the tire choice starts with the exact configuration, not just the model name. Checking the sub-model, the wheel diameter, and the size already mounted on the vehicle helps prevent ordering a tire meant for the other GL450 setup.
Choosing the Right Tire
What should I consider when choosing a tire for a 2011 Mercedes-Benz Trucks GL450?
Start with the correct size for the truck's configuration: 275/55R19 for the Base model or 275/50R20 for the GL450 w/Appearance Pkg. Since both fitments are radial, the core decision is not construction type but selecting the proper size for the wheel diameter already on the vehicle.
After size is confirmed, compare the tire's intended use with how the GL450 is driven. A large luxury SUV benefits from maintaining proper overall proportions, so wheel compatibility, clearance, and the condition of any non-stock suspension or wheel changes should all be reviewed before replacement.
How do I choose between the available 275/55R19 and 275/50R20 tires for a 2011 Mercedes-Benz Trucks GL450?
The choice between 275/55R19 and 275/50R20 is determined by the vehicle's wheel package, not by personal preference alone. The Base GL450 uses 275/55R19, while the GL450 w/Appearance Pkg. uses 275/50R20, so each size belongs to a specific setup on the truck.
Once the correct size is established, compare replacement tires within that same size rather than treating the two sizes as interchangeable. A buyer should verify wheel diameter, inspect current wheel width and clearance, and account for any aftermarket wheel changes before moving ahead with a replacement set.
What does 275/55R19 mean on a 2011 Mercedes-Benz Trucks GL450?
On a 2011 Mercedes-Benz Trucks GL450, 275/55R19 means a tire with a nominal section width of 275 millimeters, a 55-series aspect ratio, radial construction, and a 19-inch rim diameter. It is the standard modern metric radial format, and it is the fitment used on the GL450 Base configuration.
Reading the size correctly helps avoid mixing 19-inch and 20-inch fitments on the same model line. Because the GL450 also appears with a 275/50R20 setup, the sidewall code should be matched to the actual wheel on the truck before any tire is selected or replaced.
Restoration & Appearance
Does correct tire fitment matter for a 2011 Mercedes-Benz Trucks GL450 restoration?
Yes. Even on a modern luxury SUV like the 2011 Mercedes-Benz Trucks GL450, correct tire fitment helps preserve the intended stance, wheel-to-tire relationship, and overall presentation of the vehicle. Using the proper 275/55R19 or 275/50R20 size keeps the truck aligned with the configuration it was built around.
For a restoration-oriented project, the first concern is matching the tire size to the correct wheel package rather than treating any close size as acceptable. Trucks that have been modified over time should have their current wheels measured and their installed tire markings checked before returning to a stock-style appearance.
Which tire should I choose for a period-style 2011 Mercedes-Benz Trucks GL450?
A period-style 2011 Mercedes-Benz Trucks GL450 should begin with the correct original-format sizing for its configuration: 275/55R19 on the Base model or 275/50R20 on the GL450 w/Appearance Pkg. Because both fitments are modern radial sizes, the main objective is preserving the wheel-and-tire proportions intended for that version.
Appearance-focused buyers should avoid choosing by diameter alone and should confirm the exact wheel package first. If the truck has been fitted with aftermarket wheels or altered suspension, returning to a stock-style look may require verifying wheel diameter, clearance, and how the tire sits within the wheel openings.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2011 Mercedes-Benz Trucks GL450?
Yes. Modifications can change how a tire fits on a 2011 Mercedes-Benz Trucks GL450 even when the size sounds correct on paper. Aftermarket wheels, altered wheel width, suspension changes, or ride-height changes can all affect clearance, steering travel, and the way a 275/55R19 or 275/50R20 tire sits in the chassis.
That is why the actual wheel and vehicle setup should be checked before replacement. A GL450 that no longer carries its original wheels may need fitment review beyond the model name, especially around rim diameter, inner clearance, and fender clearance during turning and suspension movement.
What should I inspect before driving a 2011 Mercedes-Benz Trucks GL450 on new tires?
Before driving a 2011 Mercedes-Benz Trucks GL450 on new tires, inspect the wheels for damage, confirm the tire size matches the wheel diameter, and make sure inflation is set correctly for the installation. It is also wise to look over suspension and steering components that could affect tire wear or handling.
A short road test should be paired with a check for rubbing, vibration, or uneven clearance at full steering lock. Since this GL450 comes with either a 19-inch or 20-inch fitment, verifying that the mounted tire matches the vehicle's actual wheel package is especially important.
How often should tires on a 2011 Mercedes-Benz Trucks GL450 be inspected?
Tires on a 2011 Mercedes-Benz Trucks GL450 should be inspected regularly, not just when tread looks worn. Pressure, tread condition, cuts, bulges, cracking, and signs of air loss are all worth checking, especially on a heavier SUV where tire condition has a strong effect on ride quality and road behavior.
A routine visual check before longer drives is a sensible habit, and low-use vehicles deserve attention as well because age can matter even when miles are limited. It also helps to recheck the sidewall size during inspection so the truck is still running the correct 275/55R19 or 275/50R20 fitment.
