The 2014 Mercedes-Benz Trucks ML550 sits in the modern luxury SUV era, where strong V8 power, all-weather capability, and upscale road manners all had to work together in one package. Buyers looking at this exact vehicle are usually balancing appearance, everyday drivability, and keeping the wheel-and-tire setup true to the truck’s intended character. The 2014 Mercedes-Benz Trucks ML550 uses radial tires in two sizes, 255/50R19 and 265/45R20, so the first step is confirming which wheel diameter is on the vehicle. Once that is settled, the decision shifts to selecting the right metric radial size and checking that any replacement matches the truck’s wheel setup and overall clearance.
Which Tire Size Is Right for The 2014 Mercedes-Benz Trucks ML550
The 2014 Mercedes-Benz Trucks ML550 uses two primary tire sizes, and the difference comes down to 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 wheels on the truck is the first step before choosing tires. Once wheel size is confirmed, the main decision becomes selecting the correct metric radial fitment for that setup.
The 255/50R19 size uses a modern metric radial format: 255 is the nominal section width in millimeters, 50 is the aspect ratio, R identifies radial construction, and 19 is the rim diameter in inches. On the 2014 Mercedes-Benz Trucks ML550, this size supports a contemporary SUV fitment with a 19-inch wheel. It is the right choice only for trucks equipped with the corresponding 19-inch rim setup. Before selecting a replacement, confirm that the vehicle still has its intended wheel diameter and has not been changed to a different wheel package.
The 265/45R20 size is also a modern metric radial, with 265 indicating nominal section width in millimeters, 45 identifying the aspect ratio, R marking radial construction, and 20 showing the rim diameter in inches. For the 2014 Mercedes-Benz Trucks ML550, this size belongs to a 20-inch wheel configuration rather than the 19-inch setup. That makes wheel confirmation especially important before buying tires. If the truck has been altered with different wheels or a changed suspension stance, it is worth checking clearance and overall fitment before finalizing this size.
Fitment is straightforward here because the covered sub-model uses the same two radial tire sizes found on the core 2014 Mercedes-Benz Trucks ML550 listing. The important step is not trim identification so much as confirming whether the truck is on 19-inch or 20-inch wheels before choosing tires.
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2014 Mercedes-Benz Trucks ML550 Base
The 2014 Mercedes-Benz Trucks ML550 Base uses the same two radial fitment paths as the overall model, with one size tied to a 19-inch wheel and the other to a 20-inch wheel. Tire selection starts with verifying which wheel package is actually on the truck, then choosing the matching 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 2014 Mercedes-Benz Trucks ML550 tire sizes, wheel-diameter differences, sub-model fitment, and the practical checks that matter before replacing tires on a modern luxury SUV.
Tire Size & Fitment
What tire size fits a 2014 Mercedes-Benz Trucks ML550?
The 2014 Mercedes-Benz Trucks ML550 uses two primary tire sizes: 255/50R19 and 265/45R20. Both are radial metric sizes, and both are correct for this model depending on which wheel package is on the vehicle.
The important point is that these are not interchangeable choices unless the truck has the matching wheel diameter. A 19-inch tire must stay on a 19-inch rim, and a 20-inch tire must stay on a 20-inch rim. Before ordering replacements, check the wheel size currently installed and make sure the truck has not been changed with aftermarket wheels or other fitment-altering modifications.
What size rim does a 2014 Mercedes-Benz Trucks ML550 use?
A 2014 Mercedes-Benz Trucks ML550 uses either a 19-inch rim or a 20-inch rim, depending on which of its two tire sizes is on the vehicle. The 255/50R19 size matches a 19-inch rim, while the 265/45R20 size matches a 20-inch rim.
That makes rim diameter the first thing to confirm before shopping for tires. The easiest way is to read the tire sidewall already on the truck or verify the wheel size directly. Once rim diameter is settled, tire selection becomes much simpler. It is also smart to confirm that the wheels are the intended size for the vehicle if a previous owner changed the wheel package.
Do all 2014 Mercedes-Benz Trucks ML550 sub-models use the same tire size?
The covered 2014 Mercedes-Benz Trucks ML550 Base can use the same two tire sizes associated with this model: 255/50R19 and 265/45R20. Both are radial fitments, so the key difference is wheel diameter rather than a change in tire construction.
That means sub-model naming is less important than confirming the actual wheels on the truck. Even within the Base listing, the vehicle may be on either the 19-inch or 20-inch setup. Looking at the current tire sidewall, measuring wheel diameter, or checking the wheel itself helps prevent ordering the right type of tire in the wrong diameter.
Choosing the Right Tire
What should I consider when choosing a tire for a 2014 Mercedes-Benz Trucks ML550?
Start with the correct size for the wheel package on the truck: 255/50R19 for a 19-inch rim or 265/45R20 for a 20-inch rim. Because both are radial metric fitments, the first decision is wheel diameter, followed by choosing a replacement that matches the intended size and construction.
After size is confirmed, look at how the ML550 is used. A truck driven regularly may prioritize a straightforward modern radial replacement, while one with aftermarket wheels needs extra attention to fitment details. It is also worth checking tire age, condition, and whether the vehicle still sits at its intended ride height so the replacement choice stays compatible with the setup already on the truck.
How do I choose between the available 2014 Mercedes-Benz Trucks ML550 tire sizes?
The two sizes are not alternatives to compare by preference alone; each one belongs to a different wheel diameter. A 2014 Mercedes-Benz Trucks ML550 on 19-inch wheels uses 255/50R19, while a truck on 20-inch wheels uses 265/45R20.
That means the decision is really about identifying the wheel setup already in place. Once that is clear, stay with the matching size unless the truck is being intentionally reconfigured with different wheels and a full fitment review. Checking the current sidewall marking, wheel diameter, and overall wheel-and-suspension setup helps prevent a mismatch between tire and rim.
Why does the 2014 Mercedes-Benz Trucks ML550 have more than one tire size?
The 2014 Mercedes-Benz Trucks ML550 has more than one tire size because it can be equipped with different wheel diameters. One fitment uses 255/50R19 on a 19-inch rim, and the other uses 265/45R20 on a 20-inch rim.
That difference matters because tire size follows wheel size. The truck does not simply use whichever of the two sizes looks closest. Buyers should confirm the actual wheels mounted on the vehicle and then select the matching tire size. Any prior wheel changes, appearance packages, or custom setups should also be checked carefully before choosing replacement tires.
Restoration & Appearance
Does correct tire fitment matter for a 2014 Mercedes-Benz Trucks ML550 restoration or preservation project?
Yes, correct tire fitment still matters on a 2014 Mercedes-Benz Trucks ML550 even though it is a newer collector-era vehicle for some owners. Using the proper 255/50R19 or 265/45R20 size keeps the truck aligned with its intended wheel-diameter setup and helps preserve its overall stance.
Appearance can change noticeably when the wrong diameter or profile is installed, even if the difference seems small on paper. For an owner preserving the truck’s original look, start by confirming which wheel package belongs on that specific vehicle. If exact historical presentation is important, compare the current setup against window-sticker, delivery, or marque-specific reference material before replacing tires.
How does tire size affect the appearance of a 2014 Mercedes-Benz Trucks ML550?
Tire size has a visible effect on a 2014 Mercedes-Benz Trucks ML550 because the two primary fitments are tied to different wheel diameters. A 255/50R19 presents the truck on a 19-inch rim, while a 265/45R20 presents it on a 20-inch rim, so the wheel-and-sidewall balance changes with each setup.
That visual balance matters to owners trying to keep the truck close to its intended character. Moving away from the correct size can alter the relationship between the wheel opening, sidewall height, and overall stance. Before making a change for appearance reasons, confirm the truck’s actual wheel package and make sure any alternative setup has been checked for proper clearance and compatibility.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2014 Mercedes-Benz Trucks ML550?
Yes, modifications can affect tire fitment on a 2014 Mercedes-Benz Trucks ML550. Wheel changes, altered offsets, suspension lowering, lift changes, or body modifications can all influence whether a 255/50R19 or 265/45R20 tire remains appropriate for the vehicle’s actual setup.
A truck that no longer has its original wheel package should be checked carefully before replacement tires are chosen. Wheel diameter is only the starting point; steering clearance, fender clearance, and suspension travel still matter. Even if the tire size looks familiar on the sidewall, it is smart to confirm the full wheel-and-tire combination before assuming the same fitment still works.
What should I inspect before driving a 2014 Mercedes-Benz Trucks ML550 on new tires?
Before driving a 2014 Mercedes-Benz Trucks ML550 on new tires, inspect that the installed size matches the wheel diameter and that all four tires are seated properly. It is also wise to confirm air pressure, check valve stems, and make sure there is no rubbing at the inner fender, suspension, or steering components.
A short, careful test drive helps confirm that the truck tracks normally and that there are no clearance noises during turns or over bumps. Rechecking pressure after the initial drive is also worthwhile. On a vehicle like the ML550, any vibration or contact should be addressed immediately so the new tires are not damaged by an overlooked wheel or suspension issue.
How often should tires on a 2014 Mercedes-Benz Trucks ML550 be inspected?
Tires on a 2014 Mercedes-Benz Trucks ML550 should be inspected regularly, not only when tread looks worn. A visual check for cracking, cuts, bulges, uneven wear, and pressure loss should become part of routine ownership, especially on a vehicle that may alternate between frequent road use and longer parked periods.
Regular inspection matters because tire condition can change before wear becomes obvious. Looking over the sidewalls and tread before longer drives is a sensible habit, and any change in ride feel, vibration, or steering response deserves attention. Low-use vehicles also benefit from pressure checks during storage periods so the tires are not left underinflated for extended time.
