The 2012 Mercedes-Benz Trucks R350 blends luxury people-mover comfort with the long-wheelbase, all-weather practicality that made the R-Class such a distinctive choice in its era. Its road manners and upscale character put tire fitment front and center, especially because this exact model can use two different radial sizes depending on configuration. The 2012 Mercedes-Benz Trucks R350 appears with either 255/50R19 or 265/45R20, so the first step is confirming which wheel package is on the vehicle. From there, the real choice is matching the correct modern metric radial size to the vehicle’s wheels, appearance, and intended driving use without overlooking clearance or prior wheel changes.
Which Tire Size Is Right for The 2012 Mercedes-Benz Trucks R350
The 2012 Mercedes-Benz Trucks R350 uses two primary tire sizes, and the correct one depends on the vehicle’s exact sub-model and wheel setup. Both are metric radial sizes, but they mount on different rim diameters, so confirming whether the vehicle has 19-inch or 20-inch wheels should come before comparing tire options or replacing a worn set.
255/50R19 is a metric radial size in which 255 identifies the nominal section width in millimeters, 50 is the aspect ratio, R indicates radial construction, and 19 is the wheel diameter in inches. On the 2012 Mercedes-Benz Trucks R350, this size is part of the primary fitment and serves as the only listed size for the Bluetec 4Matic, while also appearing on the 4Matic. Choosing this size starts with verifying that the vehicle actually has 19-inch wheels, then matching the tire to the vehicle’s intended use and overall wheel setup.
265/45R20 is a metric radial size with a 265-millimeter nominal section width, a 45-series profile, radial construction, and a 20-inch rim requirement. For the 2012 Mercedes-Benz Trucks R350, this size applies to the 4Matic configuration and represents the larger wheel fitment used within this model range. Its role is distinct from the 19-inch fitment, so the practical decision is less about preference and more about confirming wheel diameter first, then checking that the tire choice matches the vehicle’s current wheels and any suspension or wheel changes made over time.
Sub-model fitment matters on the 2012 Mercedes-Benz Trucks R350 because tire size is not completely uniform across the range. Checking the exact sub-model helps narrow the correct radial size and avoids confusion between the 19-inch and 20-inch wheel fitments.
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2012 Mercedes-Benz Trucks R350 4Matic
The 2012 Mercedes-Benz Trucks R350 4Matic can use either of the model’s primary radial sizes, making wheel confirmation especially important before replacement. Tire selection here begins with identifying whether the vehicle is on 19-inch or 20-inch wheels, then choosing a matching tire for that exact setup.
The 2012 Mercedes-Benz Trucks R350 Bluetec 4Matic uses the 255/50R19 radial size, which makes fitment more straightforward than on the standard 4Matic. The main concern is confirming that the vehicle still carries its 19-inch wheel setup and has not been changed to an aftermarket package.
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
Tire questions for the 2012 Mercedes-Benz Trucks R350 usually center on identifying the correct size, confirming 19-inch versus 20-inch wheels, and understanding how sub-model fitment affects replacement choices. The FAQs below focus on fitment, tire selection, and practical inspection points before road use.
Tire Size & Fitment
What tire size fits a 2012 Mercedes-Benz Trucks R350?
The 2012 Mercedes-Benz Trucks R350 uses either 255/50R19 or 265/45R20, depending on the vehicle’s exact configuration. Both are radial tire sizes, and they are not interchangeable as primary fitments because they require different wheel diameters.
The most important step is confirming the actual wheels on the vehicle before ordering replacement tires. The R350 4Matic appears with both sizes, while the R350 Bluetec 4Matic uses 255/50R19, so checking the sub-model and the wheel itself helps prevent selecting a tire for the wrong rim diameter.
What size rim does a 2012 Mercedes-Benz Trucks R350 use?
A 2012 Mercedes-Benz Trucks R350 uses either a 19-inch or 20-inch rim, depending on which tire size is on the vehicle. The 255/50R19 size mounts on a 19-inch rim, while the 265/45R20 size requires a 20-inch rim.
Rim diameter should be verified before any tire purchase because the two R350 sizes are tied to different wheel packages. Looking only at the model name is not enough on this application, especially with the 4Matic, so the wheel marking, current tire sidewall, and actual vehicle setup should all agree.
Do all 2012 Mercedes-Benz Trucks R350 sub-models use the same tire size?
No, tire fitment is not completely the same across all 2012 Mercedes-Benz Trucks R350 sub-models. The Bluetec 4Matic uses 255/50R19, while the 4Matic appears with both 255/50R19 and 265/45R20 depending on the wheel configuration.
That difference makes sub-model identification more than a minor detail. It is still wise to confirm the actual tire size on the vehicle because many later-model luxury vehicles have seen wheel changes over the years, and using the wrong rim diameter will stop the replacement from working regardless of brand or tread design.
Choosing the Right Tire
What should I consider when choosing a tire for a 2012 Mercedes-Benz Trucks R350?
Start with the correct primary size for the vehicle: 255/50R19 or 265/45R20. Because both sizes are radial metric fitments and use different wheel diameters, the first decision is not brand or tread style but matching the tire to the exact wheel package on the R350.
After size confirmation, compare the tire’s suitability for the way the vehicle is driven and stored. A family hauler that sees regular highway use may have different needs than a lightly used specialty vehicle, and any prior wheel, suspension, or ride-height changes should be checked before finalizing a replacement.
How do I choose between the available 2012 Mercedes-Benz Trucks R350 tire sizes?
The two R350 tire sizes are chosen by fitment, not by simple preference. A vehicle on 19-inch wheels uses 255/50R19, while a vehicle on 20-inch wheels uses 265/45R20, so the correct choice follows the wheel diameter already on the vehicle.
That means the decision should begin at the wheel, not the sidewall appearance. Confirm the sub-model, inspect the current tire markings, and verify that the wheels are original to the vehicle or part of a known change, since an aftermarket wheel package can make assumptions based on model name alone unreliable.
What rim-fitment details matter when choosing 2012 Mercedes-Benz Trucks R350 tires?
Rim diameter is the key fitment detail on the 2012 Mercedes-Benz Trucks R350 because the vehicle uses both 19-inch and 20-inch tire sizes. A 255/50R19 must be matched to a 19-inch wheel, and a 265/45R20 must be matched to a 20-inch wheel.
Wheel fitment should also be considered in a broader sense if the vehicle has been modified. Changes in wheel width, offset, or suspension height can affect clearance even when the nominal tire size seems correct, so it pays to inspect the full setup rather than treating the sidewall size as the only factor.
Restoration & Appearance
Does correct tire fitment matter for a 2012 Mercedes-Benz Trucks R350 restoration or preservation project?
Yes, correct tire fitment still matters on a 2012 Mercedes-Benz Trucks R350 even though it is a newer collector-era vehicle rather than a vintage restoration subject. Keeping the proper 255/50R19 or 265/45R20 sizing helps preserve the vehicle’s intended stance, wheel relationship, and overall presentation.
A preservation-minded owner should also pay attention to whether the wheels currently on the vehicle match the intended setup. An R350 that has been changed to a different wheel package can alter both appearance and fitment logic, so returning to the proper tire size starts with confirming the wheels as carefully as the tires.
Which tire approach suits a well-kept 2012 Mercedes-Benz Trucks R350?
A well-kept 2012 Mercedes-Benz Trucks R350 is best served by staying with the correct primary radial size for its wheel package. That means 255/50R19 for the 19-inch setup or 265/45R20 for the 20-inch setup, rather than choosing a size only because it is close.
Appearance and driving use should be considered together on this model. A carefully maintained R350 benefits from a tire that matches the vehicle’s dimensions and wheel diameter cleanly, while also supporting the refined, road-going character expected from this platform without introducing unnecessary fitment guesswork.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2012 Mercedes-Benz Trucks R350?
Yes, modifications can affect tire fitment on a 2012 Mercedes-Benz Trucks R350 even when the vehicle still appears to use one of the correct stock-size tires. Wheel changes, offset differences, suspension alterations, and ride-height changes can all influence how a 255/50R19 or 265/45R20 sits in the wheel opening.
That matters because fitment is more than matching the numbers on the sidewall. A changed setup should be checked for steering clearance, fender clearance, and overall wheel compatibility before replacement, especially on a model that already uses two different rim diameters across its range.
What should I inspect before driving a 2012 Mercedes-Benz Trucks R350 on new tires?
Before driving a 2012 Mercedes-Benz Trucks R350 on new tires, inspect the tires for proper inflation, confirm that all four match the intended size, and look over the wheels for damage or obvious mounting issues. It also helps to verify that the installed size matches the vehicle’s actual wheel diameter.
A short close-range check can prevent larger problems once the vehicle is on the road. Watch for rubbing at full steering lock, look for uneven clearance, and make sure the suspension and alignment feel settled, particularly if the vehicle has had wheel changes or has spent long periods parked between uses.
How often should tires on a 2012 Mercedes-Benz Trucks R350 be inspected?
Tires on a 2012 Mercedes-Benz Trucks R350 should be inspected regularly, not just when tread appears worn. Low-use vehicles can age out a set before they wear out, so checking inflation, sidewall condition, cracking, cuts, bulges, and uneven wear should be part of routine ownership.
Inspection becomes even more important when the vehicle sits for long periods or is used mainly for occasional trips. A quick look before driving and a more thorough check at regular service intervals can help catch aging or air-loss issues early, especially on a heavier, road-oriented vehicle like the R350.
