The 2020 Mercedes-Benz S450 sits in the modern luxury-sedan tradition where quiet high-speed composure, long-wheelbase comfort, and sharp electronic chassis tuning all depend on getting the tire setup right. On this car, tire selection is not just about replacing rubber by diameter alone, because the S450 appears with multiple radial sizes across 18-, 19-, and 20-inch wheel packages, including staggered front and rear fitments. That means some owners will be choosing between blackwall performance tires, while others may also see RWL or redline options in certain sizes. The key is matching the exact wheel and axle position before comparing style, series, and road-use priorities.
Which Tire Size Is Right for The 2020 Mercedes-Benz S450
The 2020 Mercedes-Benz S450 uses five primary tire sizes, and the correct choice depends first on the exact sub-model and wheel setup. Some versions use a single 245/50R18 size at all four corners, while others use staggered front and rear combinations on either 19-inch or 20-inch rims. Before choosing a tire, confirm whether the car has square or staggered fitment and verify the wheel diameter already on the vehicle.
245/50R18 is a metric radial size in which 245 identifies the nominal section width in millimeters, 50 is the aspect ratio, R denotes radial construction, and 18 is the rim diameter in inches. On the 2020 Mercedes-Benz S450, this size suits the square 18-inch fitment rather than the staggered wheel packages. Available choices include Pro-Trac Street Pro III tires with either RWL or redline sidewall styling. This size is the one to evaluate when the car uses matching 18-inch wheels front and rear and appearance is part of the buying decision.
245/40R20 is a metric radial size that uses a 245-millimeter nominal width, a 40-series profile, and a 20-inch rim diameter. On the 2020 Mercedes-Benz S450, it serves as a front tire size for the staggered 20-inch setup, so it should not be treated as a universal four-corner fitment. Choices include BFGoodrich, Nitto, and Pro-Trac, with blackwall, RWL, and redline sidewall treatments depending on the tire series. This size matters when front-wheel fitment, visual style, and compatibility with the car's 20-inch package all need to stay aligned.
245/45R19 is a metric radial with a 245-millimeter nominal section width, a 45-series profile, and a 19-inch rim diameter. For the 2020 Mercedes-Benz S450, this is a front-position size used with a staggered 19-inch arrangement, paired with a wider rear tire rather than used as a stand-alone match for every configuration. BFGoodrich and Nitto offerings appear here, primarily in blackwall performance-oriented series. This is the right size to review when confirming a 19-inch front wheel setup and matching the tire to the car's staggered front-to-rear layout.
275/35R20 is a metric radial size in which 275 marks the nominal width in millimeters, 35 is the aspect ratio, R means radial construction, and 20 is the wheel diameter in inches. On the 2020 Mercedes-Benz S450, this is the rear tire size for the staggered 20-inch setup, giving it a different role from the narrower front fitment. BFGoodrich, Nitto, and Pro-Trac options are available, with blackwall, RWL, and redline styles depending on the tire line. This size should be chosen only after confirming the rear axle position and the car's 20-inch wheel package.
275/40R19 is a metric radial that combines a 275-millimeter nominal section width with a 40-series profile on a 19-inch rim. For the 2020 Mercedes-Benz S450, it belongs at the rear of the staggered 19-inch setup and works alongside a narrower 245/45R19 front tire. Available options include several BFGoodrich series and the Nitto NT555 G2, generally in blackwall form. This is the size to focus on when replacing the rear tires on a 19-inch staggered car and keeping the axle-specific fitment consistent.
Sub-model fitment on the 2020 Mercedes-Benz S450 is tied closely to wheel package and axle position. Some versions use one square tire size, while others split front and rear sizes, so confirming the exact sub-model name and whether the tire is for the front or rear is essential before selection.
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2020 Mercedes-Benz S450 4Matic
The 2020 Mercedes-Benz S450 4Matic uses a single 245/50R18 radial tire size rather than a staggered front-and-rear combination. Tire selection here is more about comparing available sidewall treatments and tire series than sorting through multiple axle-specific sizes.
The 2020 Mercedes-Benz S450 4Matic Front fitment uses either 245/40R20 or 245/45R19 depending on the wheel package installed on the car. Choosing correctly starts with confirming whether the front wheel is 20 inches or 19 inches before comparing tire series or sidewall style.
The 2020 Mercedes-Benz S450 4Matic Rear fitment uses either 275/35R20 or 275/40R19, again depending on the wheel package. Rear tire selection should stay matched to the front axle setup already on the car so the staggered arrangement remains consistent.
The 2020 Mercedes-Benz S450 Base uses the same 245/50R18 radial tire size at all four corners in its square setup. That keeps fitment straightforward and shifts the decision toward tire style, series, and the overall look you want from the car.
The 2020 Mercedes-Benz S450 Base Front fitment uses 245/40R20 or 245/45R19, depending on which staggered wheel package the car carries. Confirming front wheel diameter first will narrow the correct tire quickly and help avoid mixing 19-inch and 20-inch fitments.
The 2020 Mercedes-Benz S450 Base Rear fitment uses 275/35R20 or 275/40R19 to match the corresponding staggered front setup. The practical step is verifying the rear wheel diameter and keeping the front and rear pairings within the same 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.
Best 2020 Mercedes-Benz S450 Tires for Sale
Available 2020 Mercedes-Benz S450 tire choices span BFGoodrich, Nitto, and Pro-Trac, with differences by size in tire series, sidewall treatment, and rim-width specifications. Depending on the fitment, you may be comparing blackwall performance radials or appearance-driven RWL and redline options in the same primary size.
The most useful questions for a 2020 Mercedes-Benz S450 usually center on identifying the correct tire size by wheel package and axle position, then comparing radial tire styles, brands, and maintenance checks before regular road use.
Tire Size & Fitment
What tire size fits a 2020 Mercedes-Benz S450?
The 2020 Mercedes-Benz S450 uses 245/50R18, 245/40R20, 245/45R19, 275/35R20, or 275/40R19 depending on the sub-model and wheel setup. Cars with the square 18-inch arrangement use 245/50R18, while staggered setups use narrower front tires and wider rear tires on either 19-inch or 20-inch wheels.
The practical step is confirming whether the car has matching wheels at all four corners or a staggered front-and-rear package. Wheel diameter matters just as much as tire width here, because a 19-inch fitment and a 20-inch fitment are not interchangeable simply because the overall tire diameters are close.
What size rim does a 2020 Mercedes-Benz S450 use?
A 2020 Mercedes-Benz S450 can use 18-inch, 19-inch, or 20-inch rims depending on configuration. The 245/50R18 fitment uses an 18-inch rim, the 245/45R19 and 275/40R19 sizes use 19-inch rims, and the 245/40R20 and 275/35R20 sizes use 20-inch rims.
Checking the actual wheel on the car is essential before ordering tires, especially on a used S-Class that may have changed hands or been upgraded with different factory-style wheels. Looking at the tire sidewall and confirming front and rear diameters will prevent mixing a 19-inch staggered package with a 20-inch one.
Why does the 2020 Mercedes-Benz S450 have more than one tire size?
The 2020 Mercedes-Benz S450 appears with both square and staggered fitments, which is why more than one tire size applies. Some versions use the same 245/50R18 tire at all four corners, while others use a narrower front size and a wider rear size on 19-inch or 20-inch wheel packages.
That means tire selection starts with the exact configuration rather than the model name alone. Front and rear sizes on a staggered car should be matched to the wheel package already in place, and the owner should confirm axle position before comparing brands, sidewall styles, or tire series.
Choosing the Right Tire
What should I consider when choosing a tire for a 2020 Mercedes-Benz S450?
Start with the exact tire size and wheel diameter already on the car, then confirm whether the setup is square or staggered. From there, compare the available radial tire series, sidewall style, and any rim-width or load-capacity details that apply to the specific size you need.
A 245/50R18 S450 owner may be deciding between RWL and redline styling, while a 19-inch or 20-inch staggered car may be focused more on blackwall performance-oriented choices. The best comparison is the one that keeps the fitment correct while matching the car's appearance goals and intended road use.
What sidewall styles are available for 2020 Mercedes-Benz S450 tires?
Sidewall style depends on the size. Blackwall options appear in the 19-inch and 20-inch staggered fitments, while certain Pro-Trac Street Pro III sizes also offer RWL and redline sidewall treatments, including 245/50R18, 245/40R20, and 275/35R20.
That makes sidewall choice part of the decision only after the correct fitment is confirmed. An owner looking for a cleaner contemporary look may stay with blackwall, while someone wanting a more customized visual statement may prefer RWL or redline where that style is offered in the right size.
What brands offer tires for the 2020 Mercedes-Benz S450?
Tires for the 2020 Mercedes-Benz S450 are available from BFGoodrich, Nitto, and Pro-Trac, depending on the size. Product availability varies by fitment, so some sizes have blackwall performance choices from BFGoodrich and Nitto, while others also include Pro-Trac Street Pro III options with RWL or redline styling.
Brand comparison should come after size confirmation, especially on staggered 19-inch and 20-inch cars where front and rear tires differ. Once the fitment is settled, the useful distinctions become tire series, sidewall presentation, and any published rim-width or load specifications tied to that exact size.
Restoration & Appearance
Which tire should I choose for a period-style 2020 Mercedes-Benz S450?
A period-style approach on a 2020 Mercedes-Benz S450 still begins with the exact factory-type size relationship already on the car, whether that is a square 245/50R18 setup or a staggered 19-inch or 20-inch arrangement. The appearance choice then comes from the tire series and sidewall style available in that size.
On this model, the visual decision is usually less about vintage styling and more about preserving the intended luxury-sedan presentation or adding a mild custom touch. Redline or RWL options can change the look noticeably in select sizes, so owners should balance appearance goals with correct diameter and axle placement.
How does tire construction affect the appearance of a restored 2020 Mercedes-Benz S450?
The 2020 Mercedes-Benz S450 uses radial construction across its fitments, so construction choice is not a bias-ply-versus-radial restoration question here. Appearance is shaped more by sidewall treatment, tread presentation, and keeping the correct front and rear size relationship on cars with staggered wheel packages.
That means a visually faithful presentation depends on avoiding mismatched diameters, widths, or sidewall styles from one axle to the other. Even on a modern collector vehicle, the wrong tire proportions can disrupt the car's stance, so keeping the intended package intact matters as much as the brand name on the sidewall.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2020 Mercedes-Benz S450?
Yes, modifications can affect tire fitment on a 2020 Mercedes-Benz S450. Changes such as aftermarket wheels, altered wheel widths, offset differences, suspension lowering, or body modifications can all change how a 245/50R18, 245/45R19, 275/40R19, 245/40R20, or 275/35R20 tire sits in the wheelwell.
Even when the size matches one of the known S450 fitments, a modified car may have different clearance at the fender, suspension, or steering components. Checking front and rear wheel dimensions, axle position, and available clearance before replacing tires is especially important on staggered setups where the widths already differ.
What should I inspect before driving a 2020 Mercedes-Benz S450 on new tires?
Before driving a 2020 Mercedes-Benz S450 on new tires, inspect the wheel diameter and confirm that the front and rear sizes match the car's actual setup. Tire pressure, bead seating, visible clearance to suspension and fender areas, and the general condition of the wheels should all be checked before regular use.
A short recheck after the first miles is also worthwhile, especially on staggered 19-inch or 20-inch combinations. Looking for unusual rub marks, vibration, air loss, or uneven stance can catch a wheel or fitment issue early, and any concern about load, balance, or clearance should be reviewed by a qualified tire professional.
How often should tires on a 2020 Mercedes-Benz S450 be inspected?
Tires on a 2020 Mercedes-Benz S450 should be inspected regularly, not just when tread looks low. Frequent checks for pressure loss, cuts, bulges, sidewall damage, uneven wear, and any change in ride behavior are especially important on a luxury sedan that may hide developing tire problems until they become more serious.
Cars that see occasional use still need inspection because age, storage conditions, and long parked periods can affect tire condition even when mileage is limited. A quick front-and-rear visual check, plus confirmation that the staggered sizes have not been rotated or mixed improperly, helps keep the fitment safe and consistent.
