The 2009 Mercedes-Benz S550 belongs to the W221 generation, a full-size luxury sedan known for combining high-speed touring character with the kind of road manners expected from a flagship Mercedes-Benz. Tire selection on this car is closely tied to configuration, because the S550 uses 255/45R18 in standard form while Sport Package versions move to 19-inch fitments with 255/40R19 fronts and 275/40R19 rears. That means the decision is not just about size, but also about whether the car is square or staggered. Available choices include blackwall, raised white letter, and redline radials across several performance-oriented series, so appearance and wheel setup both matter before replacement.
Which Tire Size Is Right for The 2009 Mercedes-Benz S550
Three tire sizes apply to the 2009 Mercedes-Benz S550, and the correct one depends on both sub-model and wheel setup. Standard cars and the 4Matic use an 18-inch radial, while Sport Package configurations use 19-inch radials, including a staggered front and rear arrangement on models identified separately by axle. Confirming the exact sub-model and wheel diameter is the first step before comparing tire series, sidewall style, or other product details.
A 275/40R19 tire is a wider metric radial with a 275 millimeter section width, a 40-series profile, and a 19-inch rim diameter. On the 2009 Mercedes-Benz S550, this size is used at the rear of staggered Sport Package configurations, where front and rear tire sizes are not the same. BFGoodrich and Nitto options are available here, primarily in blackwall form and across g-Force, Phenom T/A, and NT555 G2 series. This is the size to check when replacing rear tires on a sport-configured car, especially if maintaining the intended front-to-rear sizing relationship matters.
Sub-model fitment matters on the 2009 Mercedes-Benz S550 because tire size changes with drivetrain and Sport Package configuration. Some versions use a single 18-inch size, while sport-oriented setups move to 19-inch tires and, in certain cases, a separate front and rear combination.
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2009 Mercedes-Benz S550 4Matic
The 2009 Mercedes-Benz S550 4Matic uses the standard 18-inch radial setup rather than the 19-inch sport arrangement. That makes wheel diameter confirmation especially important before replacement, since this version should be evaluated as a square fitment rather than a staggered one.
The 2009 Mercedes-Benz S550 4Matic w/Sport Pkg. moves to a 19-inch radial tire size. Tire selection here should focus on confirming the sport wheel setup first, then comparing available series and sidewall treatments within the correct 19-inch size.
The 2009 Mercedes-Benz S550 Base uses the standard 18-inch radial fitment. Buyers replacing tires on this sub-model can focus on choosing among available brands, sidewall styles, and series once the car is confirmed to still wear the 18-inch wheel package.
The 2009 Mercedes-Benz S550 Base Front uses the 19-inch front size from a staggered setup. Front-axle replacement should be matched to the car's rear sizing strategy so the sport configuration remains consistent across both ends of the vehicle.
The 2009 Mercedes-Benz S550 Base Rear uses the wider 19-inch rear size associated with a staggered arrangement. Rear tire selection should account for the front tire size already on the car, especially if maintaining the intended front-to-rear balance is important.
The 2009 Mercedes-Benz S550 w/Sport Pkg. Front uses the 19-inch front fitment from the sport package setup. Choosing a replacement means staying with the proper front size and then comparing series or sidewall style without confusing it with the wider rear tire.
The 2009 Mercedes-Benz S550 w/Sport Pkg. Rear uses the wider 19-inch rear fitment. This rear position should be matched carefully to the front setup already on the vehicle, since the sport package relies on different sizes at each axle.
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 S550 Tires for Sale
Available 2009 Mercedes-Benz S550 tire choices center on 18-inch and 19-inch radials from BFGoodrich, Nitto, and Pro-Trac. Depending on size, the product grid lets you compare blackwall, RWL, and redline sidewalls along with g-Force, Phenom T/A, NT555 G2, and Street Pro III series.
Common 2009 Mercedes-Benz S550 tire questions usually come down to identifying the correct size for the exact wheel setup, understanding staggered Sport Package fitment, and comparing available radial, sidewall, and product choices before road use.
Tire Size & Fitment
What tire size fits a 2009 Mercedes-Benz S550?
The 2009 Mercedes-Benz S550 uses three possible tire sizes: 255/45R18, 255/40R19, and 275/40R19. The standard Base and 4Matic configurations use 255/45R18, while Sport Package applications use 19-inch tires, with 255/40R19 on the front and 275/40R19 on the rear where the car has a staggered setup.
The right choice depends on the exact sub-model and the wheels currently on the car. A standard 18-inch square setup should not be confused with a 19-inch sport arrangement, and a staggered front and rear combination should be verified at both axles before ordering replacement tires.
What size rim does a 2009 Mercedes-Benz S550 use?
The 2009 Mercedes-Benz S550 uses either an 18-inch or 19-inch rim, depending on configuration. The 255/45R18 tire mounts on an 18-inch rim, while the 255/40R19 and 275/40R19 sizes both use 19-inch rims as part of the Sport Package fitment family.
Rim diameter is the first thing to confirm because an 18-inch tire cannot be mounted on a 19-inch wheel, and vice versa. It also helps separate the standard square setup from the sport-oriented staggered one, which is especially important if the car has changed hands or has aftermarket wheels installed.
Why does the 2009 Mercedes-Benz S550 have more than one tire size?
More than one tire size appears on the 2009 Mercedes-Benz S550 because fitment changes with the vehicle's configuration. Standard Base and 4Matic versions use 255/45R18, while Sport Package versions move to 19-inch tires, including 255/40R19 fronts and 275/40R19 rears on staggered setups.
That means tire selection starts with identifying whether the car is standard, sport-equipped, or identified separately by front and rear position. Looking at the current wheel diameter and checking both axles is the most practical way to avoid mixing an 18-inch square fitment with a 19-inch staggered arrangement.
Choosing the Right Tire
What should I consider when choosing a tire for a 2009 Mercedes-Benz S550?
Start with the correct size and wheel diameter for the exact 2009 Mercedes-Benz S550 configuration. This car uses radial tires only, but the actual fitment may be 255/45R18 on standard setups or a 19-inch sport arrangement using 255/40R19 fronts and 275/40R19 rears.
After size is confirmed, compare the available tire series, sidewall style, and rim-width compatibility where it is stated. A buyer keeping a luxury sedan appearance may focus on a blackwall presentation, while someone after a more customized look may compare RWL or redline options in the sizes that support them.
What sidewall styles are available for 2009 Mercedes-Benz S550 tires?
Sidewall style depends on tire size. In the 2009 Mercedes-Benz S550 fitments shown here, blackwall options are available across all three sizes, while RWL and redline sidewalls appear in the 255/45R18 and 255/40R19 sizes through Pro-Trac Street Pro III products.
That gives standard and sport-front applications more visible appearance choice than the wider 275/40R19 rear size, which stays blackwall in the available products. The practical step is to match the sidewall treatment to the look of the car while keeping the correct axle size and wheel diameter unchanged.
What brands offer tires for the 2009 Mercedes-Benz S550?
Tires for the 2009 Mercedes-Benz S550 are available from BFGoodrich, Nitto, and Pro-Trac. Brand availability varies by size, with BFGoodrich appearing across all three fitments, Nitto offered in selected 18-inch and 19-inch sizes, and Pro-Trac covering the 255-width front or standard applications with alternative sidewall styling.
Brand choice should come after the correct size is confirmed, not before. Once the wheel setup is established, compare each brand's available series, sidewall presentation, and any stated rim-width or load details so the selection matches both the car's configuration and the owner's intended use.
Restoration & Appearance
Which tire should I choose for a period-style 2009 Mercedes-Benz S550?
A period-style choice for a 2009 Mercedes-Benz S550 starts with the correct original-format radial size for the car's configuration. That means 255/45R18 on standard setups or the proper 19-inch sport sizes on cars using the Sport Package arrangement, rather than choosing by appearance alone.
Once fitment is right, sidewall treatment becomes part of the visual decision. Blackwall generally preserves a more understated luxury-sedan presentation, while RWL or redline options create a more customized look in sizes where they are offered, even though that visual effect should not be confused with factory-authenticated originality.
How does tire construction affect the appearance of a restored 2009 Mercedes-Benz S550?
Tire construction is straightforward on the 2009 Mercedes-Benz S550 because the applicable fitments here are radial across the board. That means appearance differences come less from bias-ply versus radial construction and more from profile, wheel diameter, and sidewall treatment within the correct 18-inch or 19-inch size.
A standard 255/45R18 setup presents the car differently than a Sport Package staggered 19-inch arrangement, even before brand or series is considered. Buyers aiming for a restoration-oriented look should confirm the car's actual sub-model and wheel package first, then select a sidewall style that suits the desired presentation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2009 Mercedes-Benz S550?
Yes. Modifications can affect tire fitment on a 2009 Mercedes-Benz S550, especially because the car already appears in both 18-inch and 19-inch configurations and may use a staggered setup. Aftermarket wheels, suspension changes, altered ride height, or body changes can all influence what size works cleanly on the car.
A modified S550 should be checked for actual wheel diameter, wheel width, and axle-specific sizing before replacement tires are chosen. Steering clearance, inner suspension clearance, and fender room are also worth verifying, particularly when the car uses 19-inch front and rear sizes that are not the same.
What should I inspect before driving a 2009 Mercedes-Benz S550 on new tires?
Before driving a 2009 Mercedes-Benz S550 on new tires, inspect the wheel setup, confirm that front and rear sizes match the intended configuration, and check that each tire is seated correctly on the proper rim diameter. Basic condition checks should also include valve stems, wheel condition, and tire pressure.
A short, careful initial drive is a practical way to confirm there is no rubbing, vibration, or unexpected clearance issue. On a Sport Package or staggered setup, it is especially important to verify that the 255/40R19 front and 275/40R19 rear positions have not been mixed during mounting or rotation.
How often should tires on a 2009 Mercedes-Benz S550 be inspected?
Tires on a 2009 Mercedes-Benz S550 should be inspected regularly, with special attention before longer drives and after any period of storage. Inspection should cover tread condition, sidewall cracking, bulges, cuts, uneven wear, and any sign of air loss, especially on a car that may not be driven daily.
Routine checks matter even more when the S550 has a staggered setup, because front and rear tires are not interchangeable in the same way as a square arrangement. Keeping inflation in check and watching for wear differences between axles helps catch alignment, suspension, or fitment issues before they become more serious.
