The 2009 Mercedes-Benz CLS550 sits in the first generation of the CLS line, a four-door coupe that blended luxury-sedan comfort with a lower, more performance-oriented stance. Its shape and chassis tuning gave tire fitment a bigger visual and handling role than on a conventional sedan. This model uses 18-inch radial tires, with a staggered front-and-rear setup that changes between the Base configuration and the Sport Package. Available choices include blackwall performance radials, plus select redline and raised white letter options in the front 245/40R18 size. The real decision is confirming the exact setup on the car, then choosing the look and tire character that best matches how it will be driven.
Which Tire Size Is Right for The 2009 Mercedes-Benz CLS550
The 2009 Mercedes-Benz CLS550 uses four primary tire sizes, and the correct combination depends on whether the car is in Base trim or equipped with the Sport Package. All four sizes are radial tires for 18-inch rims, but the front and rear sizes differ in each setup. The first step is identifying the exact front and rear configuration on the car before comparing brands, sidewall styles, or tire series.
A 245/40R18 tire is a metric radial size with a 245-millimeter nominal section width, a 40-series profile, and an 18-inch rim diameter. On the 2009 Mercedes-Benz CLS550, this size serves as a front fitment in the Base setup and reflects the car's staggered tire arrangement. Available choices include blackwall designs from BFGoodrich, Nitto, and M&H Racemaster, along with Pro-Trac Street Pro III options in redline and raised white letter form. This size matters most when preserving the Base front fitment while still choosing between a more understated or more appearance-driven presentation.
A 275/35R18 tire uses a 275-millimeter nominal section width, a lower 35-series profile, and fits an 18-inch wheel. On the 2009 Mercedes-Benz CLS550, this is the Base rear size, pairing with the narrower 245/40R18 front for a staggered layout. Product choices in this size center on blackwall radial performance tires from BFGoodrich and Nitto, with several series available for buyers comparing brand and construction details. This rear size should be evaluated carefully when matching the Base setup, especially if the car has had wheel or suspension changes that could affect clearance.
A 255/40R18 tire is a metric radial with a 255-millimeter nominal section width, a 40-series sidewall profile, and an 18-inch rim fitment. For the 2009 Mercedes-Benz CLS550, this size is used on the front of models equipped with the Sport Package, giving that configuration a wider front tire than the Base setup. Available options are blackwall radials from BFGoodrich across multiple g-Force series. This is the size to focus on when the car has the Sport Package front setup and the goal is to maintain the intended staggered relationship with the matching rear tire.
A 285/35R18 tire combines a 285-millimeter nominal section width with a 35-series profile on an 18-inch rim. On the 2009 Mercedes-Benz CLS550, it serves as the rear tire size for the Sport Package configuration, creating the widest rear fitment used on this model. The available product in this size is a blackwall Nitto NT555 G2 radial, aimed at buyers who need to match the Sport rear specification. This size becomes especially important when confirming that the car still carries the proper rear wheel width and clearance for the Sport Package arrangement.
Sub-model fitment on the 2009 Mercedes-Benz CLS550 is tied to front and rear position as well as whether the car is Base or equipped with the Sport Package. Checking the exact configuration matters because each setup uses its own staggered tire pairing on the same 18-inch rim diameter.
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2009 Mercedes-Benz CLS550 Base Front
The Base front position uses a 245/40R18 radial tire, which is narrower than the Sport Package front fitment. Tire selection here often comes down to brand, series, and whether a blackwall, redline, or raised white letter appearance suits the car's intended look.
The Base rear position uses a 275/35R18 radial tire as part of the staggered setup. Matching this rear size correctly helps preserve the balance of the Base configuration, so wheel width and rear clearance deserve a quick check before changing tire series.
The Sport Package front position uses a 255/40R18 radial tire, giving the front axle a wider fitment than the Base model. That makes it important to confirm the car is actually on the Sport setup before choosing among the available blackwall radial options.
The Sport Package rear position uses a 285/35R18 radial tire, the widest rear size used on this CLS550 application. Tire selection is more focused here, so confirming the rear wheel setup and keeping the proper staggered match with the Sport front size is the key step.
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.
Best 2009 Mercedes-Benz CLS550 Tires for Sale
Available 18-inch radial choices for the 2009 Mercedes-Benz CLS550 include BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. Depending on size, buyers can compare blackwall options across several performance-oriented series, with select front-size choices also offered in redline and raised white letter form.
These FAQs focus on the exact tire sizes used on the 2009 Mercedes-Benz CLS550, how the Base and Sport Package setups differ, and what to compare when choosing replacement radials for appearance, fitment, and road use.
Tire Size & Fitment
What tire size fits a 2009 Mercedes-Benz CLS550?
The 2009 Mercedes-Benz CLS550 uses a staggered 18-inch radial tire setup, and the exact sizes depend on the configuration. Base models use 245/40R18 in front and 275/35R18 in the rear, while Sport Package models use 255/40R18 in front and 285/35R18 in the rear.
That means the first step is confirming both the trim setup and the tire position on the car. Front and rear sizes are not interchangeable within the staggered arrangement, and a car with aftermarket wheels may no longer match the original pattern, so wheel width and actual installed tire size should be checked before replacement.
What size rim does a 2009 Mercedes-Benz CLS550 use?
All primary tire sizes used on the 2009 Mercedes-Benz CLS550 fit an 18-inch rim. That remains true for both Base and Sport Package configurations, even though the front and rear tire widths and profiles change between the two setups.
An 18-inch rim diameter does not mean every 18-inch wheel on the car is the same in width or offset. A replacement tire still needs to match the actual wheel dimensions and the vehicle's front or rear position, especially on a staggered setup where the rear tire is substantially wider than the front.
Why does the 2009 Mercedes-Benz CLS550 have more than one tire size?
The 2009 Mercedes-Benz CLS550 has more than one tire size because it uses staggered fitments and because the Base and Sport Package configurations do not share the same front and rear pairings. Base models use 245/40R18 and 275/35R18, while Sport Package models use 255/40R18 and 285/35R18.
That difference affects more than simple width. It changes which tires belong on the front axle and which belong on the rear, so identifying the exact setup on the car matters before ordering replacements. A quick look at the existing tires and wheels is often the easiest way to confirm which staggered combination the car is actually using.
Choosing the Right Tire
What should I consider when choosing a 2009 Mercedes-Benz CLS550 tire?
Start with the correct front or rear size for the exact 2009 Mercedes-Benz CLS550 configuration, then compare the available radial choices within that size. The key variables here are tire series, sidewall style where offered, brand availability, and whether the wheel width on the car matches the intended tire.
A Base front 245/40R18 brings the widest visual choice, including blackwall, redline, and raised white letter options, while other sizes are more focused on blackwall performance radials. It also helps to consider how the car is used, since a street-driven luxury performance sedan calls for a different choice than a more specialized application.
What sidewall styles are available for 2009 Mercedes-Benz CLS550 tires?
Sidewall style depends on the specific tire size. Blackwall is the main sidewall treatment across the 2009 Mercedes-Benz CLS550 range, and the 245/40R18 front size also has additional appearance choices in redline and raised white letter form through Pro-Trac Street Pro III.
That makes sidewall style an appearance decision as much as a fitment decision, especially on the Base front setup where more visual variety exists. The rest of the fitments stay much more understated, so matching the sidewall look to the car's overall presentation is just as important as choosing the correct size.
What brands offer tires for the 2009 Mercedes-Benz CLS550?
Tires for the 2009 Mercedes-Benz CLS550 are available from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac, depending on the size. BFGoodrich covers several of the CLS550's fitments across multiple g-Force series, while Nitto appears in several staggered sizes and M&H Racemaster and Pro-Trac are specific to the 245/40R18 front size.
Brand choice should still come after confirming the exact front or rear size on the car. Some sizes offer several brands and series to compare, while the widest Sport Package rear size is far more limited, so the correct configuration often determines how broad the actual product selection will be.
Restoration & Appearance
Which tire should I choose for a period-style 2009 Mercedes-Benz CLS550?
A period-style choice for a 2009 Mercedes-Benz CLS550 starts with keeping the correct staggered size pairing for the car's Base or Sport Package setup. Within that fitment, blackwall radials preserve the cleaner modern luxury-performance look most closely associated with the model's original era.
Appearance details still matter, especially because the CLS body shape puts the wheels and tires in plain view. On a Base front 245/40R18 application, redline and raised white letter choices create a more custom presentation, while a blackwall setup keeps the car closer to its understated factory-era visual character.
How does tire construction affect the appearance of a restored 2009 Mercedes-Benz CLS550?
Tire construction is straightforward on the 2009 Mercedes-Benz CLS550 because its primary fitments are all radial. The visible appearance difference comes less from bias-ply versus radial and more from the exact size, sidewall profile, and sidewall treatment chosen within the correct staggered setup.
A restored or carefully kept CLS550 usually looks most coherent when the front and rear tires maintain the intended width relationship and overall stance. Sidewall choices can subtly or dramatically change that presentation, so matching the tire's visual style to the car's luxury-performance character is usually more important than chasing novelty.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2009 Mercedes-Benz CLS550?
Yes, modifications can affect tire fitment on a 2009 Mercedes-Benz CLS550 even when the replacement tire uses the correct nominal size. Aftermarket wheels, changes in wheel width or offset, lowered suspension, and body or alignment changes can all alter clearance at the fender, inner wheelhouse, or steering components.
That is especially important on a staggered car like the CLS550, where the rear sizes are already wider than the fronts. Checking the actual wheel setup on the car before replacing tires helps avoid surprises, particularly if a previous owner changed wheels or installed a different Base-versus-Sport-style tire combination.
What should I inspect before driving a 2009 Mercedes-Benz CLS550 on new tires?
Before driving a 2009 Mercedes-Benz CLS550 on new tires, inspect basic installation and condition points such as correct front and rear placement, proper inflation, valve-stem condition, wheel damage, and any visible interference at full steering lock. It also helps to look over suspension and alignment condition so the new tires start with a sound foundation.
A short road test should be used to confirm there is no rubbing, vibration, or unusual pull. Because this car uses staggered tire pairings, an owner should also verify that the front and rear sizes were not accidentally reversed and that both sides of each axle match the intended configuration.
What should I check before a longer drive in a 2009 Mercedes-Benz CLS550?
Before a longer drive in a 2009 Mercedes-Benz CLS550, check tire pressure, tread condition, sidewall condition, and any signs of cuts, bulges, or slow air loss. It is also smart to confirm that the car is wearing the correct front and rear tire sizes for its Base or Sport Package setup.
Longer trips place more heat and sustained load into the tires, so even a low-mile collector or secondary-use CLS550 deserves a careful inspection. Tire age, storage history, and prior curb or pothole damage can matter as much as tread depth, especially on performance-oriented low-profile 18-inch radial fitments.
