The 2008 Mercedes-Benz Trucks R350 blends the tall-roof practicality of the R-Class with the road manners and upscale feel buyers expected from Mercedes-Benz in the late 2000s. It sits in that space between wagon, crossover, and luxury family hauler, which makes proper tire selection especially important to both appearance and everyday drivability. The 2008 Mercedes-Benz Trucks R350 uses radial tire fitments in three sizes: 255/55R18, 255/50R19, and 265/45R20. That makes the real decision less about vintage construction and more about confirming the exact wheel diameter, sub-model setup, and the overall look and road-use character you want to preserve.
Which Tire Size Is Right for The 2008 Mercedes-Benz Trucks R350
Three tire sizes apply to the 2008 Mercedes-Benz Trucks R350, and the correct choice depends first on the exact wheel diameter on the vehicle. Fitment also varies by sub-model, since the 4Matic uses two sizes while the Base model can use three. Before choosing a tire, confirm whether the R350 is riding on 18-inch, 19-inch, or 20-inch wheels and make sure the current wheel setup matches the vehicle you have in front of you.
255/50R19 is a metric radial size in which 255 identifies the nominal section width in millimeters, 50 is the aspect ratio, R denotes radial construction, and 19 is the wheel diameter in inches. On the 2008 Mercedes-Benz Trucks R350, this size suits vehicles equipped with 19-inch wheels and keeps the fitment in a modern radial format consistent with the vehicle's era. It is shared by both the Base and 4Matic sub-models. This size is worth considering when the vehicle already has 19-inch wheels and you want to stay with the intended wheel-and-tire proportion for that setup.
255/55R18 is a metric radial size that uses a 255-millimeter nominal section width, a 55-series profile, and an 18-inch rim diameter. For the 2008 Mercedes-Benz Trucks R350, it is a primary fitment for both the Base and 4Matic versions equipped with 18-inch wheels. Compared with the other fitments on this vehicle, the key distinction is wheel diameter rather than a change from one tire construction type to another. Buyers should focus on verifying that the current wheels are 18-inch units and that the vehicle has not been changed to a different wheel package over time.
265/45R20 is a metric radial size where 265 is the nominal section width in millimeters, 45 is the aspect ratio, and 20 indicates the wheel diameter in inches. On the 2008 Mercedes-Benz Trucks R350, this fitment appears on the Base model and brings a slightly wider section width than the 255-series alternatives. Its role is tied to vehicles equipped with 20-inch wheels rather than to a universal fit across every R350 configuration. This is the size to evaluate only after confirming that the Base model in question is actually wearing the correct 20-inch wheel setup.
Sub-model fitment on the 2008 Mercedes-Benz Trucks R350 is not completely uniform, so checking the exact version matters before selecting tires. Both covered sub-models share some sizes, but the Base model adds an additional 20-inch fitment that does not apply across the board.
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2008 Mercedes-Benz Trucks R350 4Matic
The 2008 Mercedes-Benz Trucks R350 4Matic uses radial tire fitments in 255/55R18 and 255/50R19. Tire selection starts with confirming whether the vehicle has its 18-inch or 19-inch wheel package, then choosing a tire that suits the way the R350 is actually driven and maintained.
The 2008 Mercedes-Benz Trucks R350 Base uses radial fitments in 255/55R18, 255/50R19, and 265/45R20. That wider spread makes wheel confirmation especially important, since the right tire choice depends on whether the vehicle is currently set up with 18-inch, 19-inch, or 20-inch wheels.
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
Common questions on the 2008 Mercedes-Benz Trucks R350 usually come down to identifying the right tire size by wheel diameter and sub-model, then checking fitment, appearance, maintenance, and any changes from the vehicle's original wheel setup.
Tire Size & Fitment
What tire size fits a 2008 Mercedes-Benz Trucks R350?
The 2008 Mercedes-Benz Trucks R350 uses three primary radial tire sizes: 255/55R18, 255/50R19, and 265/45R20. The 4Matic sub-model uses 255/55R18 and 255/50R19, while the Base model uses 255/55R18, 255/50R19, and 265/45R20.
The main step is confirming which wheel diameter is actually on the vehicle before choosing a tire. An R350 may have 18-inch, 19-inch, or 20-inch wheels depending on sub-model and current setup, so the correct tire is the one that matches both the specific sub-model and the wheel package on the vehicle now.
What size rim does a 2008 Mercedes-Benz Trucks R350 use?
A 2008 Mercedes-Benz Trucks R350 can use 18-inch, 19-inch, or 20-inch rims, depending on the tire size fitted to the vehicle. The corresponding tire sizes are 255/55R18 for 18-inch rims, 255/50R19 for 19-inch rims, and 265/45R20 for 20-inch rims.
That means there is no single rim diameter that applies to every R350. Checking the wheel itself, the current tire sidewall, and the exact sub-model helps prevent choosing a tire that matches the vehicle year and model name but not the wheel diameter actually installed on the vehicle.
Do all 2008 Mercedes-Benz Trucks R350 sub-models use the same tire size?
No, not every 2008 Mercedes-Benz Trucks R350 sub-model uses the same tire size. The 4Matic shares 255/55R18 and 255/50R19 with the Base model, but the Base model also uses 265/45R20, which adds a third fitment not shared across all versions.
That difference matters because tire choice is tied to both sub-model and wheel diameter. A buyer should confirm whether the vehicle is a Base or 4Matic and then verify the actual wheel size on the vehicle, especially if it has changed hands or may have received a different wheel package over time.
Choosing the Right Tire
What should I consider when choosing a tire for a 2008 Mercedes-Benz Trucks R350?
Start with the basics: the correct tire size for the sub-model and the wheel diameter currently on the vehicle. The 2008 Mercedes-Benz Trucks R350 uses modern radial sizes, so the key selection points are 255/55R18, 255/50R19, or 265/45R20 rather than a choice between vintage sizing systems.
After size is confirmed, compare the tire's intended use with how the vehicle is driven. A family-use R350, a lightly used luxury hauler, and a vehicle wearing aftermarket wheels may call for different fitment checks, so pay attention to wheel width, clearance, overall condition of the suspension, and whether the current setup still matches the original wheel package.
How do I choose between the available tire sizes for a 2008 Mercedes-Benz Trucks R350?
The available sizes are not interchangeable choices for style alone. Each size corresponds to a specific wheel diameter, with 255/55R18 for 18-inch rims, 255/50R19 for 19-inch rims, and 265/45R20 for 20-inch rims, and the 20-inch fitment applies to the Base model.
The right way to choose is to match the tire to the wheel and the exact vehicle configuration rather than selecting by appearance first. Looking at the tire sidewall and measuring or verifying the wheel diameter is especially important on an R350 that may have had wheel changes, replacement rims, or previous-owner modifications.
Should I keep the same wheel-and-tire size on my 2008 Mercedes-Benz Trucks R350?
Keeping the same wheel-and-tire size is usually the cleanest approach when replacing tires on a 2008 Mercedes-Benz Trucks R350. Staying with the size already matched to the vehicle's wheel package helps preserve the intended relationship between tire dimensions, wheel diameter, and the way the vehicle sits and drives.
A change in size can affect more than appearance, particularly if it also involves a different rim diameter. Before moving away from the existing setup, confirm that the replacement plan works with the wheels, body clearance, and suspension condition, and make sure the chosen size still suits the specific Base or 4Matic configuration.
Restoration & Appearance
Does correct tire fitment matter for a 2008 Mercedes-Benz Trucks R350 restoration?
Yes, correct tire fitment still matters on a 2008 Mercedes-Benz Trucks R350, even though it is a newer vehicle than most restoration-focused classics. The right size helps preserve the proper stance, wheel fill, and overall presentation, while also keeping the vehicle aligned with the wheel package intended for that specific configuration.
An appearance-focused project should begin by confirming whether the vehicle is a Base or 4Matic and whether it should be on 18-inch, 19-inch, or 20-inch wheels. If exact originality is important, compare the current setup with marque-specific reference material so cosmetic changes from previous ownership do not lead tire selection in the wrong direction.
Which tire size best preserves the original look of a 2008 Mercedes-Benz Trucks R350?
The size that best preserves the original look of a 2008 Mercedes-Benz Trucks R350 is the one that matches the wheel diameter and fitment used on that specific vehicle. For this model, that means staying with 255/55R18, 255/50R19, or 265/45R20 as appropriate to the exact sub-model and wheel package.
Visual character on an R350 comes largely from the proportion between wheel and sidewall, so changing diameters can noticeably alter the vehicle's stance. Buyers focused on a clean period appearance should confirm the current wheels are appropriate for the vehicle before replacing tires, rather than assuming any one of the three sizes belongs on every example.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2008 Mercedes-Benz Trucks R350?
Yes, modifications can affect tire fitment on a 2008 Mercedes-Benz Trucks R350. Changes such as aftermarket wheels, altered wheel widths, suspension lowering, or body modifications can change the space available around the tire even when the vehicle still carries one of the recognized R350 tire sizes.
That is why size alone is not the full answer on a used vehicle. A buyer should verify wheel diameter, wheel width, and clearance at the fender, steering, and suspension before assuming the current setup remains suitable, especially on a Base model that may have moved between 18-inch, 19-inch, and 20-inch wheel packages.
What should I inspect before driving a 2008 Mercedes-Benz Trucks R350 on new tires?
Before driving a 2008 Mercedes-Benz Trucks R350 on new tires, inspect the wheel diameter and condition, make sure the tires match the vehicle's actual fitment, and check that the suspension and steering components are in sound condition. It also helps to confirm there are no obvious rubbing points or damage around the wheel openings.
Once the tires are installed, keep an eye on inflation pressure, early signs of uneven wear, and any vibration or pulling that appears on the road. Those checks matter on a tall, heavy vehicle like the R350 because a mismatch in setup or a neglected alignment issue can show up quickly after tire replacement.
How often should tires on a 2008 Mercedes-Benz Trucks R350 be inspected?
Tires on a 2008 Mercedes-Benz Trucks R350 should be inspected regularly, not just when tread looks worn. A quick visual check before routine use and a more careful inspection at service intervals helps catch cracking, cuts, bulges, uneven wear, and air loss before they turn into larger problems.
That routine is especially useful on an R350 that sees mixed use, longer highway trips, or periods of sitting between drives. Checking pressure, tread condition, and shoulder wear can also reveal suspension or alignment issues early, which is valuable when the vehicle may be running one of three different wheel-and-tire combinations.
