The 2014 Mercedes-Benz Trucks GL450 sits in the modern luxury SUV world, blending full-size utility with the road manners and refinement buyers expect from a Mercedes-Benz. On a vehicle like this, tire selection plays a major role not only in appearance, but also in ride quality, wheel compatibility, and overall stance. The 2014 Mercedes-Benz Trucks GL450 uses radial tires in two primary sizes, 275/50R20 and 275/55R19, so the first step is confirming which wheel diameter is on the vehicle. From there, the decision becomes choosing the right metric radial for your wheel setup, intended road use, and any changes made to the wheels or suspension.
Which Tire Size Is Right for The 2014 Mercedes-Benz Trucks GL450
The 2014 Mercedes-Benz Trucks GL450 uses two primary tire sizes, and both are radial metric fitments tied to different wheel diameters. Before selecting a tire, the most important step is confirming whether the vehicle has 19-inch or 20-inch wheels, since the two sizes are close in overall proportions but are not built for the same rim diameter.
The size code 275/50R20 identifies a metric radial tire with a 275-millimeter nominal section width, a 50-series aspect ratio, and fitment for a 20-inch wheel. On the 2014 Mercedes-Benz Trucks GL450, this size suits vehicles equipped with the larger 20-inch rim setup. Its lower-profile sidewall compared with the 19-inch option gives this fitment a distinct wheel-and-tire presentation while remaining within the vehicle’s primary radial sizing family. Choosing this size starts with confirming the actual wheel diameter on the vehicle, especially if it has been purchased used or fitted with alternate factory-style wheels.
The size code 275/55R19 denotes a metric radial tire with a 275-millimeter nominal section width, a 55-series aspect ratio, and fitment for a 19-inch wheel. For the 2014 Mercedes-Benz Trucks GL450, this is the companion primary size used on the 19-inch wheel configuration. It carries the same nominal width as the 20-inch fitment but pairs that width with a different sidewall profile and a different rim diameter. This size should be chosen only after verifying that the vehicle actually uses 19-inch wheels, since matching tire size to wheel diameter is the key fitment decision here.
Fitment is straightforward here because the covered GL450 sub-model shares the same two primary tire sizes. The main point is not trim differentiation, but confirming which wheel diameter is installed before choosing between the 19-inch and 20-inch tire sizes.
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2014 Mercedes-Benz Trucks GL450 Base
The 2014 Mercedes-Benz Trucks GL450 Base uses radial tire fitments in both available wheel-diameter configurations. Tire selection comes down to confirming whether the vehicle is equipped with 19-inch or 20-inch wheels, then choosing the correct metric radial size for that 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
These FAQs focus on the two tire sizes used on the 2014 Mercedes-Benz Trucks GL450, along with wheel-diameter confirmation, fitment checks, tire selection strategy, and practical inspection points before regular road use.
Tire Size & Fitment
What tire size fits a 2014 Mercedes-Benz Trucks GL450?
The 2014 Mercedes-Benz Trucks GL450 uses two primary tire sizes: 275/50R20 and 275/55R19. Both are radial metric sizes, and each one corresponds to a different wheel diameter rather than a different tire construction style.
The key step is confirming which wheels are actually on the vehicle. A GL450 that has 20-inch wheels needs the 275/50R20 size, while a GL450 with 19-inch wheels needs 275/55R19. Since many luxury SUVs are bought used and sometimes fitted with different factory-style or aftermarket wheels, checking the wheel diameter directly is more reliable than assuming one size applies to every vehicle.
What size rim does a 2014 Mercedes-Benz Trucks GL450 use?
The 2014 Mercedes-Benz Trucks GL450 uses either a 20-inch rim with 275/50R20 tires or a 19-inch rim with 275/55R19 tires. Those two tire sizes are built for different wheel diameters, so the rim size must match the tire exactly.
This matters because the two GL450 tire sizes are close in overall proportions but cannot be mounted interchangeably on the same wheel. A quick inspection of the wheel and the tire sidewall will usually confirm which setup is on the SUV. That check is especially important if the vehicle has had wheel changes, replacement wheels, or a prior owner who moved from one factory-style diameter to the other.
Why does the 2014 Mercedes-Benz Trucks GL450 have more than one tire size?
The 2014 Mercedes-Benz Trucks GL450 has more than one tire size because it uses two different wheel-diameter configurations. The 275/55R19 size fits the 19-inch setup, while 275/50R20 fits the 20-inch setup, and both remain within the vehicle’s primary radial fitment range.
That means the decision is not about choosing whichever size looks close enough. It is about matching the tire to the actual wheel diameter already on the vehicle. Since the nominal section width stays the same, buyers sometimes overlook the importance of the rim size, but the 19-inch and 20-inch tire sizes are not interchangeable without changing the wheels as well.
Choosing the Right Tire
What should I consider when choosing a 275/50R20 tire for a 2014 Mercedes-Benz Trucks GL450?
A 275/50R20 tire for a 2014 Mercedes-Benz Trucks GL450 should first be selected on correct size and wheel compatibility. This size is intended for the GL450’s 20-inch wheel setup, so the starting point is confirming that the vehicle actually has 20-inch rims rather than the alternate 19-inch configuration.
After size confirmation, look at the vehicle’s use and condition. A GL450 that spends most of its time on pavement may call for a different tread style and ride emphasis than one that sees heavier cargo duty or varied road conditions. It also helps to inspect the current wheel width, suspension condition, and clearance around the fenders if the SUV has aftermarket wheels or any ride-height changes.
What should I consider when choosing a 275/55R19 tire for a 2014 Mercedes-Benz Trucks GL450?
Choosing a 275/55R19 tire for a 2014 Mercedes-Benz Trucks GL450 starts with verifying the 19-inch wheel setup. The size itself tells you the tire is a metric radial built for a 19-inch rim, so using it on the alternate 20-inch wheel configuration is not an option.
Once the wheel diameter is confirmed, focus on how the vehicle is actually driven and whether anything has changed from standard wheel or suspension dimensions. Tire age, wear pattern, and alignment condition are also worth checking before replacing only one or two tires. Those details help the new tire work as intended and reduce the chance of chasing vibration, irregular wear, or clearance concerns afterward.
How do I choose between the available tire sizes for a 2014 Mercedes-Benz Trucks GL450?
The two tire sizes for a 2014 Mercedes-Benz Trucks GL450 are not alternatives to be chosen purely by preference. The correct choice is determined by the wheel diameter already on the vehicle: 275/55R19 for 19-inch wheels and 275/50R20 for 20-inch wheels.
That makes wheel verification the first step, not tread comparison or appearance. Once the correct size is established, the next considerations are the vehicle’s intended use, the condition of the current wheels, and whether any modifications have affected fitment. On a used GL450, checking the sidewall markings and measuring the wheel diameter can prevent ordering the right-looking tire in the wrong fitment.
Restoration & Appearance
Does correct tire fitment matter for a 2014 Mercedes-Benz Trucks GL450 restoration or refurbishment?
Correct tire fitment matters on a 2014 Mercedes-Benz Trucks GL450 because the vehicle uses two specific radial sizes tied to two different wheel diameters. Keeping the right size on the right wheel helps preserve the intended proportions, stance, and overall presentation of the SUV.
For a clean refurbishment or collector-minded refresh, tire selection should support the wheel setup already on the vehicle rather than forcing a near match. A GL450 with factory-style 19-inch wheels should keep the 275/55R19 fitment, while a 20-inch setup should remain with 275/50R20. When appearance originality matters closely, wheel type and tire size should be reviewed together rather than as separate decisions.
Which tire size should I keep for a period-appropriate 2014 Mercedes-Benz Trucks GL450 appearance?
A period-appropriate appearance on a 2014 Mercedes-Benz Trucks GL450 starts with retaining the tire size that matches the vehicle’s wheel diameter. That means 275/55R19 belongs with the 19-inch setup, while 275/50R20 belongs with the 20-inch setup.
The visual character of the SUV changes when wheel diameter and tire profile change, even when the overall tire height stays fairly close. Keeping the correct size for the installed wheels usually preserves the most natural look. On a vehicle that has changed hands or been customized, it is smart to confirm both wheel diameter and current tire markings before deciding what best suits a stock-style presentation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2014 Mercedes-Benz Trucks GL450?
Yes, modifications can affect tire fitment on a 2014 Mercedes-Benz Trucks GL450. Wheel changes, altered offset, suspension lowering or lifting, and body modifications can all influence whether the original 275/50R20 or 275/55R19 fitment still clears properly in real driving conditions.
That is why it helps to inspect more than just the size stamped on the current tire. A GL450 with aftermarket wheels may place the tire differently inside the wheelwell even when the nominal size remains unchanged. Checking steering clearance, suspension travel, and visible rubbing marks before ordering replacement tires can prevent avoidable fitment problems on a modified vehicle.
What should I inspect before driving a 2014 Mercedes-Benz Trucks GL450 on new tires?
Before driving a 2014 Mercedes-Benz Trucks GL450 on new tires, inspect wheel condition, confirm the correct tire size for the wheel diameter, and make sure the tires are inflated properly for the vehicle’s needs. It is also wise to look over the suspension and alignment if the old tires showed uneven wear.
A careful road-use check should include sidewall clearance at full steering lock, visible fender clearance, and a short drive to catch vibration or rubbing early. On a heavier luxury SUV, worn suspension components can hide behind old tire wear and then become more noticeable once fresh tires are installed. Addressing those issues early helps the new tires wear evenly and drive as expected.
How often should tires on a 2014 Mercedes-Benz Trucks GL450 be inspected?
Tires on a 2014 Mercedes-Benz Trucks GL450 should be inspected regularly, especially for pressure loss, uneven tread wear, sidewall damage, and age-related deterioration. Even when mileage is modest, a full-size SUV places meaningful demands on its tires, so casual visual checks alone are not enough.
A good routine is to check pressures and general condition frequently and give the tires a closer inspection before longer trips. Looking at the inside shoulder, not just the outer tread, can reveal alignment or suspension issues early. On a vehicle with either 275/50R20 or 275/55R19 tires, catching wear or air-loss problems early is one of the simplest ways to protect ride quality and fitment stability.
