The 2021 Mercedes-Benz S500 sits at the modern flagship end of the luxury sedan market, combining long-wheelbase comfort, advanced chassis technology, and the kind of road manners buyers expect from an S-Class. Tire selection on this car is more configuration-driven than old-school replacement shopping, because the S500 uses multiple modern metric radial sizes across 19-, 20-, and 21-inch wheel setups, including staggered front and rear fitments. Available choices here focus on radial construction, with differences in brand, series, and sidewall treatment depending on size. The key is confirming the exact wheel and front-or-rear application before choosing a tire that matches the car's intended appearance and road use.
Which Tire Size Is Right for The 2021 Mercedes-Benz S500
The 2021 Mercedes-Benz S500 uses five primary tire sizes, and the correct one depends on wheel diameter and whether the tire is for a standard 4Matic setup or a staggered front-and-rear arrangement. Before choosing a tire, confirm whether the car is on 19-inch, 20-inch, or 21-inch wheels and whether you are replacing a front tire, a rear tire, or a matched set.
255/40R20 is a modern metric radial size in which 255 identifies the nominal section width in millimeters, 40 is the aspect ratio, R marks radial construction, and 20 is the rim diameter in inches. On the 2021 Mercedes-Benz S500, this size works within a 20-inch fitment and appears in both a standard 4Matic application and a front-wheel position on staggered setups. Available choices include a BFGoodrich g-Force Phenom T/A in blackwall form. This size is the one to evaluate when the car has 20-inch wheels and the fitment calls for a 255-section front or all-around tire.
255/45R19 follows the same metric radial format, with a 255-millimeter nominal section width, a 45-series profile, radial construction, and a 19-inch rim diameter. On the 2021 Mercedes-Benz S500, this size belongs to a 19-inch 4Matic fitment rather than the larger staggered 20- or 21-inch combinations. Its overall diameter stays close to the other primary S500 sizes, but wheel diameter still has to match exactly. This is the correct size to focus on when the car remains on its 19-inch wheel package and does not use the larger front-and-rear staggered arrangement.
255/35R21 is a low-profile metric radial size, with 255 as the nominal section width in millimeters, 35 as the aspect ratio, R for radial construction, and 21 for the rim diameter. On the 2021 Mercedes-Benz S500, this size is used on the front in a 21-inch staggered setup. Its role is tied to front-axle fitment, so it should not be treated as a universal size for every S500 configuration. This is the size to verify when replacing front tires on an S500 equipped with the larger 21-inch wheel package.
285/30R21 is a wider low-profile metric radial, where 285 indicates the nominal section width in millimeters, 30 is the aspect ratio, R denotes radial construction, and 21 is the rim diameter. On the 2021 Mercedes-Benz S500, this size is used at the rear in the 21-inch staggered configuration, paired with a narrower front tire. The wider section and rear-specific role make position especially important during replacement. Choose this size only when the S500 is equipped with the 21-inch rear fitment and the existing wheel setup confirms the same rear tire specification.
285/35R20 is a modern metric radial size with a 285-millimeter nominal section width, a 35-series profile, radial construction, and a 20-inch rim diameter. On the 2021 Mercedes-Benz S500, it serves as the rear tire in a 20-inch staggered arrangement, not as an all-around fitment for every configuration. This size has the broadest visible product choice, including BFGoodrich, Nitto, and Pro-Trac options in blackwall, raised white letter, and redline styles across g-Force, NT555 G2, and Street Pro III series. It is the size to compare most closely when the car uses 20-inch rear wheels and appearance is part of the decision.
Sub-model fitment on the 2021 Mercedes-Benz S500 is driven by wheel package and axle position rather than one universal tire size across the board. Checking the exact 4Matic, front, or rear application matters first, because the car uses both square and staggered radial fitments in different diameters.
1
2021 Mercedes-Benz S500 4Matic
The 2021 Mercedes-Benz S500 4Matic uses either a 255/45R19 or 255/40R20 radial tire, depending on the wheel package on the car. Tire selection starts with confirming whether the sedan is on 19-inch or 20-inch wheels, then matching the replacement to the existing setup.
The 2021 Mercedes-Benz S500 4Matic Front fitment uses a 255-section radial tire, with either a 255/35R21 or 255/40R20 depending on the front wheel package. That means front-tire replacement should be based on the actual wheel diameter and the staggered setup already on the vehicle.
The 2021 Mercedes-Benz S500 4Matic Rear fitment uses a wider 285-section radial tire, either 285/30R21 or 285/35R20. Rear replacement requires confirming the wheel diameter first, then choosing a tire that matches the rear position rather than assuming the front and rear sizes are the same.
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 2021 Mercedes-Benz S500 Tires for Sale
Available product choices center on 255/40R20 and especially 285/35R20, with radial options from BFGoodrich, Nitto, and Pro-Trac. Buyers can compare series such as g-Force Phenom T/A, g-Force Comp 2 AS, NT555 G2, and Street Pro III, along with blackwall, raised white letter, and redline sidewall treatments.
Common questions for the 2021 Mercedes-Benz S500 usually come down to exact tire size, wheel diameter, front-versus-rear fitment, and how to choose among the available radial options. The details matter because this S-Class uses multiple modern metric sizes across several wheel packages.
Tire Size & Fitment
What tire size fits a 2021 Mercedes-Benz S500?
The 2021 Mercedes-Benz S500 uses several primary tire sizes rather than one universal fitment. Those sizes are 255/45R19, 255/40R20, 255/35R21, 285/35R20, and 285/30R21, all in radial construction. Which one applies depends on the wheel package and, on staggered setups, whether the tire is being replaced on the front or rear axle.
The first step is matching the replacement tire to the wheel diameter already on the car. After that, confirm whether the S500 uses the same size at all four corners or a staggered arrangement with narrower front tires and wider rear tires, because choosing by vehicle year and model alone is not enough.
What size rim does a 2021 Mercedes-Benz S500 use?
The 2021 Mercedes-Benz S500 appears with 19-inch, 20-inch, and 21-inch rim diameters. The 255/45R19 size uses a 19-inch rim, the 255/40R20 and 285/35R20 sizes use 20-inch rims, and the 255/35R21 and 285/30R21 sizes use 21-inch rims. Every tire listed for this car is a radial designed for one of those exact wheel diameters.
Wheel diameter has to match the tire exactly, so a 20-inch tire cannot be used on a 19-inch or 21-inch wheel. It also helps to confirm whether the car has a square setup or a staggered front-and-rear package, because the S500 can use different widths front to rear even when both tires share the same construction type.
Why does the 2021 Mercedes-Benz S500 have more than one tire size?
The 2021 Mercedes-Benz S500 has more than one tire size because it was fitted with different wheel packages and also appears in staggered front-and-rear configurations. A standard 4Matic setup can use 255-section tires on 19-inch or 20-inch wheels, while staggered arrangements pair a narrower 255-section front tire with a wider 285-section rear tire.
That makes the car more configuration-sensitive than a sedan with one all-around fitment. Tire replacement should start with the actual wheel and axle position on the vehicle, especially if only two tires are being replaced, because the front and rear sizes on staggered setups are intentionally different.
Choosing the Right Tire
What should I consider when choosing a tire for a 2021 Mercedes-Benz S500?
Start with the exact size already on the car, because the 2021 Mercedes-Benz S500 uses multiple radial fitments across 19-, 20-, and 21-inch wheels. On some setups, the car uses the same width at all four corners, while others use a staggered arrangement with a 255-section front tire and a 285-section rear tire.
Once size and axle position are confirmed, compare the available tire's series, sidewall treatment, and wheel-width suitability where that specification is given. That approach keeps the decision focused on proper fitment first, then lets appearance and product character guide the final choice without mixing front and rear applications.
What sidewall styles are available for 2021 Mercedes-Benz S500 tires?
The available sidewall styles for the 2021 Mercedes-Benz S500 include blackwall, RWL, and redline, depending on tire size. Blackwall appears in both 255/40R20 and 285/35R20 offerings, while the visible style variety is concentrated in 285/35R20, where raised white letter and redline options are also available.
Sidewall style is mainly an appearance decision after the correct size, wheel diameter, and front-or-rear position have been confirmed. On a modern S-Class, blackwall keeps the most understated look, while RWL and redline create a more distinctive presentation, but those style options should only be considered within the exact tire size the car requires.
What brands offer tires for the 2021 Mercedes-Benz S500?
The available brands for the 2021 Mercedes-Benz S500 include BFGoodrich, Nitto, and Pro-Trac. BFGoodrich appears in both 255/40R20 and 285/35R20 applications, while Nitto and Pro-Trac are available in 285/35R20. The visible series include g-Force Phenom T/A, g-Force Comp 2 AS, NT555 G2, and Street Pro III.
Brand choice should come after confirming the exact tire size and wheel setup on the car. Once fitment is settled, the meaningful comparison points are series type, sidewall styling, and any stated rim-width compatibility, rather than assuming every brand offering applies across all S500 wheel and axle configurations.
Restoration & Appearance
Which tire should I choose for a period-style 2021 Mercedes-Benz S500?
A period-style approach on a 2021 Mercedes-Benz S500 still starts with the correct modern metric radial size for the wheel package on the car. Since this S-Class is a contemporary luxury sedan, the visual decision is usually less about vintage construction and more about keeping the proportions, wheel diameter, and overall presentation appropriate to the original setup.
Blackwall tires usually maintain the most restrained factory-inspired appearance, while sizes such as 285/35R20 also open the door to more expressive sidewall treatments. The cleaner choice is often to preserve the wheel-and-tire relationship already on the car rather than forcing a different size simply for style.
Which sidewall style suits a period-style 2021 Mercedes-Benz S500?
For a period-style 2021 Mercedes-Benz S500, blackwall is the most natural visual fit among the available sidewall treatments. It matches the understated look most buyers expect from a modern luxury sedan, especially on factory-style wheel packages. RWL and redline options are available in some 285/35R20 tires, but they create a much more customized appearance.
The best choice depends on whether the goal is to keep the car visually close to its original character or to lean into a more personalized look. Sidewall treatment should always come after confirming the exact rear or front tire size, because style options do not override the basic wheel and axle fitment requirements.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2021 Mercedes-Benz S500?
Yes, modifications can affect tire fitment on a 2021 Mercedes-Benz S500. Aftermarket wheels, changes in wheel width, altered offset, lowering, or suspension changes can all influence how a 255- or 285-section tire sits in the wheel well. That matters even more on staggered setups, where front and rear tire sizes already differ by design.
A modified S500 should be checked for wheel diameter, tire-to-fender clearance, inner suspension clearance, and steering clearance before replacing tires. Matching the size printed on the current tire is not always enough if the wheel or suspension setup has been changed from stock, especially on 20- and 21-inch applications.
What should I inspect before driving a 2021 Mercedes-Benz S500 on new tires?
Before driving a 2021 Mercedes-Benz S500 on new tires, confirm that each tire matches the intended front or rear position and the correct wheel diameter. It also makes sense to inspect for even bead seating, proper inflation, and any visible interference with suspension components or bodywork, particularly on low-profile 20- and 21-inch fitments.
A short initial road check can reveal vibration, rubbing, or other signs that the tire and wheel setup needs another look. On a car with staggered sizing, verify that the wider rear tires and narrower front tires have not been mixed, because that can create immediate fitment and handling issues.
How often should tires on a 2021 Mercedes-Benz S500 be inspected?
Tires on a 2021 Mercedes-Benz S500 should be inspected regularly, not just when tread looks low. A quick visual check for uneven wear, cuts, bulges, cracking, and pressure loss is worthwhile throughout the driving season, and low-profile radial tires deserve extra attention because small changes in pressure or damage can be more noticeable in everyday use.
Longer intervals between inspections are especially risky if the car sees mixed road conditions or sits for stretches between drives. Checking condition often also helps catch front-to-rear wear differences on staggered setups, where the 255-section front tires and 285-section rear tires may age and wear differently.
