The 2009 Mercedes-Benz Trucks R350 blends wagon-like practicality with the road manners and long-distance comfort that defined Mercedes luxury people-movers of its era. Buyers looking after one today are often balancing everyday drivability with the need to preserve the vehicle’s proper stance and refinement. Tire fitment centers on two radial sizes, 255/50R19 and 255/55R18, and the first step is confirming which wheel diameter is actually on the vehicle. Because both sizes share the same overall diameter but use different rim diameters, selection is less about changing the vehicle’s profile and more about matching the existing wheel setup, intended use, and tire design preferences.
Which Tire Size Is Right for The 2009 Mercedes-Benz Trucks R350
The 2009 Mercedes-Benz Trucks R350 uses two primary tire sizes, and both are radial fitments tied to different wheel diameters. The key decision is confirming whether the vehicle is on 18-inch or 19-inch wheels before choosing a tire, especially since the 4Matic configuration can be found with either size. Once wheel diameter is confirmed, the focus shifts to selecting the right tire within that fitment rather than trying to compare unrelated sizes.
255/50R19 is a metric radial size where 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 2009 Mercedes-Benz Trucks R350, this size suits vehicles equipped with 19-inch wheels and maintains the road-focused, modern tire construction expected for this platform. Its dimensions make it part of a fitment path that keeps the vehicle’s overall tire height in line with the alternate size. The practical takeaway is simple: choose this size only after confirming the R350 is actually wearing 19-inch wheels.
255/55R18 is a metric radial size in which 255 gives the nominal section width in millimeters, 55 is the aspect ratio, R means radial, and 18 is the wheel diameter in inches. For the 2009 Mercedes-Benz Trucks R350, this size belongs on 18-inch wheels and offers the same stated overall diameter as the 19-inch fitment alternative. That makes it a wheel-specific choice rather than a larger or smaller overall tire package. Buyers should verify wheel diameter directly and then evaluate tire options within this size for ride character, construction details, and intended road use.
Sub-model fitment is straightforward here, but wheel choice still matters. The 2009 Mercedes-Benz Trucks R350 4Matic can use either of the two radial sizes, so identifying the actual wheel diameter on the vehicle is more important than the sub-model name alone.
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2009 Mercedes-Benz Trucks R350 4Matic
The 2009 Mercedes-Benz Trucks R350 4Matic uses radial tire fitments in two wheel-diameter paths rather than one fixed size. Tire selection starts with confirming whether the vehicle has 18-inch or 19-inch wheels, then choosing the correct tire within that matched fitment.
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 for the 2009 Mercedes-Benz Trucks R350 usually center on which of the two tire sizes applies, how wheel diameter affects selection, and what to inspect before putting the vehicle back into regular road use.
Tire Size & Fitment
What tire size fits a 2009 Mercedes-Benz Trucks R350?
The 2009 Mercedes-Benz Trucks R350 uses two radial tire sizes: 255/50R19 and 255/55R18. Both sizes are valid for this vehicle, but they are tied to different wheel diameters rather than being interchangeable on the same rim.
The important next step is checking the actual wheels on the vehicle before ordering tires. An R350 with 19-inch wheels needs 255/50R19, while one with 18-inch wheels needs 255/55R18. Since both sizes share the same stated overall diameter, the main concern is matching the tire to the wheel, then confirming clearance and overall condition if the vehicle has been modified.
What size rim does a 2009 Mercedes-Benz Trucks R350 use?
A 2009 Mercedes-Benz Trucks R350 can use either an 18-inch or 19-inch rim, depending on which tire size is on the vehicle. The 255/55R18 tire belongs on an 18-inch rim, and the 255/50R19 tire belongs on a 19-inch rim.
That means rim diameter should be confirmed before anything else, especially on a used vehicle where wheels may have been changed at some point. Reading the current tire sidewall and checking the wheel itself are both worthwhile. Once rim diameter is settled, the correct tire size becomes clear, and the rest of the decision can focus on tire type, condition needs, and intended road use.
Why does the 2009 Mercedes-Benz Trucks R350 have more than one tire size?
The 2009 Mercedes-Benz Trucks R350 has more than one tire size because it can be equipped with two different wheel diameters. One fitment uses 255/55R18 on an 18-inch rim, while the other uses 255/50R19 on a 19-inch rim.
In practical terms, this is a wheel-based fitment difference, not a sign that any size can be mixed freely. Both sizes carry the same stated overall diameter, but each must match its proper rim diameter. Anyone replacing tires on an R350 should confirm the exact wheel setup already on the vehicle and avoid choosing a size simply because it appears close on paper.
Choosing the Right Tire
What should I consider when choosing a tire for a 2009 Mercedes-Benz Trucks R350?
Start with the correct size for the wheels currently on the vehicle. The 2009 Mercedes-Benz Trucks R350 uses either 255/50R19 or 255/55R18, and both are radial sizes, so the correct choice depends first on wheel diameter rather than appearance or preference.
After confirming size, look at the vehicle’s intended use and overall condition. A regularly driven R350 may call for a different tire character than one used occasionally, but either way the tire should match the wheel and maintain proper clearance. It also helps to inspect the suspension and alignment condition, since those can affect tire wear and the way a replacement set performs.
How do I choose between the available tire sizes for a 2009 Mercedes-Benz Trucks R350?
The choice is made by the wheels already on the 2009 Mercedes-Benz Trucks R350, not by selecting whichever size seems more appealing. A vehicle with 18-inch wheels uses 255/55R18, while a vehicle with 19-inch wheels uses 255/50R19.
Since both sizes have the same stated overall diameter, the real difference is wheel compatibility. There is no advantage in trying to force one size onto the wrong rim diameter. Check the sidewall on the current tires, verify the wheel measurement if needed, and keep all four tires matched to the proper size unless a qualified professional is evaluating a broader wheel-and-tire change.
How do I choose between the available radial tires for a 2009 Mercedes-Benz Trucks R350?
Once the correct size is confirmed, choosing among radial tires for a 2009 Mercedes-Benz Trucks R350 comes down to using a tire that matches the vehicle’s wheel diameter, intended use, and general condition needs. The R350’s fitment itself is already modern radial, so the main goal is staying within the correct size path.
A good comparison process includes checking that all four tires are the same size, reviewing wear patterns on the old set, and considering whether the vehicle sees mostly highway miles or lighter seasonal use. It is also smart to inspect alignment, suspension wear, and inflation habits, since those factors can matter as much as the tire choice itself.
Restoration & Appearance
Does correct tire fitment matter for a 2009 Mercedes-Benz Trucks R350 restoration?
Correct tire fitment still matters on a 2009 Mercedes-Benz Trucks R350, even though it is a newer vehicle than traditional collector-era cars. The proper size preserves the intended relationship between the tire, wheel, and body, and it helps the vehicle retain the balanced appearance and road manners expected of an R-Class model.
A restoration-minded owner should begin by confirming whether the vehicle is on its appropriate 18-inch or 19-inch wheel setup. From there, keeping the right 255-width metric radial size helps avoid an under- or over-tired look. When presentation matters, matching all four tires and keeping the wheel-and-tire package consistent usually makes a larger visual difference than chasing unusual substitutions.
Which tire should I choose for a period-style 2009 Mercedes-Benz Trucks R350?
A period-style approach for a 2009 Mercedes-Benz Trucks R350 starts with using the correct original-format metric radial size for the wheel diameter on the vehicle. That means 255/55R18 on 18-inch wheels or 255/50R19 on 19-inch wheels, rather than moving to a non-matching diameter or an unrelated sizing format.
This kind of vehicle generally looks most cohesive when the tire profile remains in the range intended for its wheel package. Keeping the right size also helps preserve the visual proportion between the tire sidewall and the R350’s body. If originality matters beyond basic fitment, compare the current setup with vehicle-specific reference material before making appearance-driven changes.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2009 Mercedes-Benz Trucks R350?
Yes, modifications can affect tire fitment on a 2009 Mercedes-Benz Trucks R350. Aftermarket wheels, suspension changes, altered ride height, or body changes can influence whether 255/50R19 or 255/55R18 still has the necessary clearance at the fenders, steering components, and suspension points.
Even though both factory fitment paths share the same stated overall diameter, wheel width and offset changes can still create issues. That is why the current wheel-and-suspension setup should be checked before replacing tires on a modified vehicle. A careful inspection at full steering lock and under normal suspension load can prevent expensive size mistakes.
What should I inspect before driving a 2009 Mercedes-Benz Trucks R350 on new tires?
Before driving a 2009 Mercedes-Benz Trucks R350 on new tires, inspect the wheels for damage, confirm the correct tire size for the installed rim diameter, and make sure the tires are properly inflated. It is also wise to look at alignment condition, brake clearance, and any visible suspension wear that may affect how the new tires settle in.
A short road test should follow once everything is mounted and balanced. Pay attention to vibration, pulling, rubbing at full steering lock, and any uneven stance that suggests another problem. Catching those issues early matters on a vehicle like the R350, where ride quality and stable highway behavior are closely tied to proper wheel-and-tire setup.
How often should tires on a 2009 Mercedes-Benz Trucks R350 be inspected?
Tires on a 2009 Mercedes-Benz Trucks R350 should be inspected regularly, not just when they look visibly worn. A monthly check is a sensible habit for pressure, tread wear, cracking, cuts, and any signs of uneven wear, especially on a vehicle that may spend stretches parked between longer drives.
It also helps to inspect the tires before road trips or after the vehicle has been sitting for a while. Low-use vehicles can still develop age-related issues even when tread depth looks acceptable. Watching for air loss, sidewall changes, and irregular wear patterns can reveal problems early and helps keep the R350’s ride and stability consistent.
