The 2004 Mercedes-Benz S55 AMG blends full-size S-Class luxury with the supercharged AMG performance character that defined many flagship German sedans of its era. It is a car that asks for tire fitment to be treated as part of the driving experience, not just routine maintenance. This model uses a staggered radial setup with 245/45R18 in front and 265/40R18 in the rear, both on 18-inch rims. Available choices stay within a modern blackwall performance look, with options from BFGoodrich and Nitto across several sport-oriented series. The key is matching the correct front and rear sizes while confirming the car still carries its intended wheel and suspension configuration.
Which Tire Size Is Right for The 2004 Mercedes-Benz S55 AMG
The 2004 Mercedes-Benz S55 AMG uses two primary tire sizes, and they are tied to position on the car rather than interchangeable fitment. Both are radial tires for 18-inch rims, with 245/45R18 used at the front and 265/40R18 at the rear. The first step is confirming that the car still has its correct staggered wheel setup, because choosing the right tire starts with knowing which axle you are replacing.
245/45R18 is a metric radial size in which 245 refers to section width in millimeters, 45 is the aspect ratio, R identifies radial construction, and 18 is the rim diameter in inches. On the 2004 Mercedes-Benz S55 AMG, this size is used on the front, where steering response and proper clearance depend on keeping the intended fitment. Available choices include blackwall performance tires from BFGoodrich and Nitto in series such as g-Force Comp 2 AS, g-Force Sport Comp 2, Nitto NT555 G2, and g-Force Phenom T/A. This is the size to evaluate when replacing front tires or refreshing the front half of the staggered setup.
265/40R18 is also a metric radial size, with a 265-millimeter section width, a 40-series profile, radial construction, and an 18-inch rim diameter. On the 2004 Mercedes-Benz S55 AMG, this size is used on the rear, reflecting the car’s staggered tire layout rather than a same-size arrangement at all four corners. In the available product range, this rear fitment appears in a blackwall BFGoodrich g-Force Phenom T/A offering. This is the size to focus on when rear tires need replacement and when confirming that wheel width and rear clearance still match the intended setup.
Fitment on the 2004 Mercedes-Benz S55 AMG is straightforward in one sense and specific in another: the covered front and rear positions each use their own tire size. Checking the exact position matters because the car uses a staggered arrangement rather than the same size at all four corners.
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2004 Mercedes-Benz S55 AMG Base Front
The 2004 Mercedes-Benz S55 AMG Base Front uses a 245/45R18 radial tire on an 18-inch rim. That means front tire selection centers on choosing the correct performance-oriented radial while keeping the steering axle matched to the intended size and wheel width range.
The 2004 Mercedes-Benz S55 AMG Base Rear uses a 265/40R18 radial tire on an 18-inch rim. Rear tire replacement should be approached as a position-specific fitment decision, with attention to correct wheel width, rear clearance, and keeping the staggered front-to-rear relationship intact.
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 2004 Mercedes-Benz S55 AMG Tires for Sale
Available 2004 Mercedes-Benz S55 AMG tire choices center on 18-inch blackwall radials from BFGoodrich and Nitto. The front 245/45R18 fitment offers several sport-oriented series to compare, while the rear 265/40R18 fitment is represented by a BFGoodrich g-Force Phenom T/A option.
The most common questions for the 2004 Mercedes-Benz S55 AMG center on its staggered front and rear tire sizes, 18-inch rim fitment, available radial choices, and what to inspect before driving or replacing tires on a high-performance luxury sedan.
Tire Size & Fitment
What tire size fits a 2004 Mercedes-Benz S55 AMG?
The 2004 Mercedes-Benz S55 AMG uses a staggered tire setup with 245/45R18 on the front and 265/40R18 on the rear. Both are radial sizes for 18-inch rims, so this car does not use one universal size at all four corners.
That fitment means the first question is whether you are replacing front tires, rear tires, or the full set. It is also worth confirming that the car still has the intended wheel arrangement, because aftermarket wheels or prior changes can blur the original front-to-rear sizing pattern.
What size rim does a 2004 Mercedes-Benz S55 AMG use?
The 2004 Mercedes-Benz S55 AMG uses 18-inch rims with both of its primary tire sizes. The front 245/45R18 and rear 265/40R18 sizes are both built around an 18-inch wheel diameter, even though the section width and profile differ between front and rear.
Wheel diameter is only part of the fitment picture, so the next step is checking actual wheel width and confirming which axle you are working on. A tire can share the same 18-inch diameter yet still require a different wheel-width range or create different clearance considerations.
Why does the 2004 Mercedes-Benz S55 AMG have more than one tire size?
The 2004 Mercedes-Benz S55 AMG has more than one tire size because it uses a staggered setup, with 245/45R18 in front and 265/40R18 in the rear. The rear tire is wider, while both sizes remain matched to 18-inch rims and radial construction.
For the owner, that means tire selection is position-specific rather than one-size-fits-all. Front and rear replacements should be matched to the correct axle, and any departure from the staggered layout should be checked carefully against the wheel setup, clearance, and overall driving goals.
Choosing the Right Tire
What should I consider when choosing a 245/45R18 and 265/40R18 tire for a 2004 Mercedes-Benz S55 AMG?
Start with the correct axle position, since the 2004 Mercedes-Benz S55 AMG uses 245/45R18 in front and 265/40R18 in the rear. Construction is straightforward because both primary sizes are radial, so the real comparison points are wheel-width compatibility, tire series, brand, load capacity, and the kind of road use the car sees.
A front tire choice may offer more series variation, while the rear fitment can be narrower in product selection. It helps to compare the tire against the wheel already on the car and keep the overall staggered setup consistent rather than selecting by size label alone.
What sidewall styles are available for 2004 Mercedes-Benz S55 AMG tires?
The available tires for the 2004 Mercedes-Benz S55 AMG use a blackwall sidewall style. That keeps the appearance aligned with a modern performance-sedan presentation rather than introducing whitewall, redline, or other vintage-style sidewall treatments that belong to much earlier vehicle eras.
Since sidewall appearance does not vary here, selection comes down more to series, brand, fitment position, and wheel-width compatibility. That can simplify the decision for owners who want the right size and a clean OE-era visual character without sorting through multiple decorative sidewall options.
What brands offer tires for the 2004 Mercedes-Benz S55 AMG?
BFGoodrich and Nitto both appear in the available tire selection for the 2004 Mercedes-Benz S55 AMG. BFGoodrich covers both the front 245/45R18 and rear 265/40R18 fitments, while Nitto appears in the front 245/45R18 size.
That brand spread matters mainly on the front axle, where there is more series variety to compare. A sensible approach is to begin with the correct size and wheel-width range, then compare each brand’s available series and specifications instead of assuming the same choices exist at both ends of the car.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2004 Mercedes-Benz S55 AMG?
Yes, modifications can affect tire fitment on a 2004 Mercedes-Benz S55 AMG even when the tire size looks correct on paper. Aftermarket wheels, suspension changes, lowering, alignment changes, or brake upgrades can all alter the space available for a 245/45R18 front or 265/40R18 rear tire.
The practical check is to verify wheel diameter, wheel width, and actual front-to-rear setup before replacing tires. It is also smart to inspect steering and fender clearance at full lock and under compression, especially if the car no longer sits at stock ride height.
What should I inspect before driving a 2004 Mercedes-Benz S55 AMG on new tires?
Before driving a 2004 Mercedes-Benz S55 AMG on new tires, inspect inflation pressure, wheel condition, valve stems, lug torque, and tire direction or mounting position if applicable. A close look at alignment-related wear points, suspension condition, and any signs of rubbing is also worthwhile on a high-performance sedan.
That inspection is especially important on a staggered setup, because front and rear tires do different jobs and must remain in their intended positions. A short test drive followed by a recheck for air loss, vibration, or clearance contact can catch issues early before normal road use begins.
What should I check before a longer drive in a 2004 Mercedes-Benz S55 AMG?
Before a longer drive, make sure the 2004 Mercedes-Benz S55 AMG has the correct 245/45R18 front and 265/40R18 rear tires, proper inflation, and even tread condition. Sidewalls should be checked for cracking, bulges, or cuts, and each wheel should be inspected for damage that could affect balance or sealing.
Longer trips put more sustained heat and load into the tire, so aging or marginal-condition tires deserve extra attention even if tread depth still looks acceptable. It also helps to confirm that the car tracks straight, shows no unusual vibration, and has no evidence of clearance trouble from prior wheel or suspension changes.
