The 2021 Mercedes-Benz CLS450 blends coupe-like styling with modern grand-touring character, giving the car a strong visual presence while still serving as a refined luxury sedan. On this model, tire selection centers on a staggered radial setup, with 245-section front sizes and 275-section rear sizes offered in either 19-inch or 20-inch fitments. That means the key decision is not simply brand, but matching the correct front and rear size pair to the wheel diameter already on the car. Available choices lean toward blackwall performance-oriented radials from BFGoodrich and Nitto, so appearance, tire series, and wheel compatibility all matter when replacing a set.
Which Tire Size Is Right for The 2021 Mercedes-Benz CLS450
The 2021 Mercedes-Benz CLS450 uses four primary tire sizes across a staggered front-and-rear setup, and the fitment changes with 19-inch versus 20-inch wheels. Confirming the wheel diameter on the car comes first, because the front and rear sizes are paired to that rim size. Once that is settled, the real choice becomes comparing the available radial tire series, brand options, and product specifications within the correct size.
245/35R20 is a metric radial size with a 245-millimeter section width, a 35-series aspect ratio, and a 20-inch rim diameter. On the 2021 Mercedes-Benz CLS450, this size serves the front position on 20-inch wheel setups and keeps the staggered balance matched to the wider rear tire. Available choices include blackwall radials from BFGoodrich and Nitto, with tire series such as g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2. This is the size to evaluate when the car already wears 20-inch front wheels and the goal is to stay with the proper front fitment format.
245/40R19 is a metric radial size that uses a 245-millimeter section width, a 40-series profile, and a 19-inch rim diameter. For the 2021 Mercedes-Benz CLS450, it is the front tire size used with the 19-inch staggered setup rather than the 20-inch package. BFGoodrich offers this size in blackwall form across g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A series, giving buyers a few distinct ways to approach road use and tire character. This size should be considered when the car has 19-inch front wheels and needs the matching front tire for that wheel package.
275/30R20 is a metric radial size with a 275-millimeter section width, a 30-series aspect ratio, and a 20-inch rim diameter. On the 2021 Mercedes-Benz CLS450, this is the rear tire size paired with 20-inch front and rear wheels in the staggered arrangement. The available product choice in this size is a blackwall Nitto NT555 G2, so selection is more about confirming the correct wheel package and rear fitment than comparing multiple sidewall or series treatments. It belongs on the rear of a 20-inch setup and should be matched carefully with the corresponding front size.
275/35R19 is a metric radial size that combines a 275-millimeter section width with a 35-series profile on a 19-inch rim. For the 2021 Mercedes-Benz CLS450, it serves the rear position on cars equipped with the 19-inch staggered setup. Blackwall options are available from BFGoodrich and Nitto, including g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2, so buyers can compare series character as well as fitment details. This is the rear size to use when the car has 19-inch wheels and needs the proper wider rear companion to the front tire.
Sub-model fitment on the 2021 Mercedes-Benz CLS450 is straightforward because both Base and 4Matic configurations use the same front and rear size pairings. The important check is whether the car has the 19-inch or 20-inch wheel setup, since that determines both front and rear tire sizes.
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2021 Mercedes-Benz CLS450 4Matic Front
The 2021 Mercedes-Benz CLS450 4Matic Front uses a 245-section radial front tire, paired with either a 19-inch or 20-inch wheel package. Tire selection at this position comes down to matching the wheel diameter already on the car and then comparing the available blackwall performance-oriented product choices in the correct size.
The 2021 Mercedes-Benz CLS450 4Matic Rear uses the wider 275-section radial rear fitment, again split between 19-inch and 20-inch wheel packages. Rear tire choice should stay aligned with the car's existing wheel diameter and the corresponding front size so the staggered setup remains properly matched.
The 2021 Mercedes-Benz CLS450 Base Front follows the same front tire pattern as the 4Matic version, using a 245-section radial on either a 19-inch or 20-inch wheel. That keeps selection focused on wheel confirmation first, then on comparing tire series and product details within the proper front size.
The 2021 Mercedes-Benz CLS450 Base Rear uses the same wider 275-section radial rear fitment found on the 4Matic version, with size choice tied to 19-inch or 20-inch wheels. Matching the rear size to the existing wheel diameter and corresponding front tire is the key step before comparing specific product options.
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 CLS450 Tires for Sale
Available 2021 Mercedes-Benz CLS450 tires center on radial blackwall fitments from BFGoodrich and Nitto. Depending on size, buyers can compare series such as g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2, along with rim-width compatibility in several applications.
Owners of a 2021 Mercedes-Benz CLS450 usually need to sort out wheel diameter, staggered front-and-rear sizing, and the differences between the available radial tire series. These FAQs focus on fitment, product choice, and the practical checks that matter before the car goes back on the road.
Tire Size & Fitment
What tire size fits a 2021 Mercedes-Benz CLS450?
The 2021 Mercedes-Benz CLS450 uses a staggered radial setup rather than one uniform tire size at all four corners. Front sizes are 245/40R19 or 245/35R20, while rear sizes are 275/35R19 or 275/30R20, depending on whether the car has 19-inch or 20-inch wheels.
That makes wheel diameter the first thing to confirm before choosing tires. A 19-inch front tire must be paired with the matching 19-inch rear tire, and the same applies to the 20-inch setup. Checking the actual wheels on the car is especially important if it has had a previous tire change or wheel swap.
What size rim does a 2021 Mercedes-Benz CLS450 use?
The 2021 Mercedes-Benz CLS450 uses either 19-inch or 20-inch rims, depending on the tire package on the car. The 19-inch setup pairs 245/40R19 in front with 275/35R19 in the rear, while the 20-inch setup pairs 245/35R20 in front with 275/30R20 in the rear.
Rim diameter should be verified directly at the wheel before replacing tires, because the front and rear sizes are tied to that diameter. It also helps to confirm wheel width when comparing products, since several available tires include rim-width ranges that should line up with the wheels already installed.
Do all 2021 Mercedes-Benz CLS450 sub-models use the same tire size?
Base and 4Matic versions of the 2021 Mercedes-Benz CLS450 follow the same fitment pattern, using a 245-section radial tire in front and a 275-section radial tire in the rear. The variation comes from the wheel package, with either a 19-inch or 20-inch staggered size pair.
That means sub-model identification matters less than confirming whether the car wears 19-inch or 20-inch wheels. Front and rear tires should be selected as a matched size pair for that wheel diameter, since mixing the wrong front or rear size can upset fitment, appearance, and basic compatibility.
Choosing the Right Tire
What should I consider when choosing a 2021 Mercedes-Benz CLS450 tire?
Start with the correct position and wheel diameter, because the 2021 Mercedes-Benz CLS450 uses different front and rear sizes in both 19-inch and 20-inch form. After that, compare the available radial tire series, brand options, and any stated rim-width ranges for the size you need.
It also helps to think about how the car is used. A buyer may prefer one series for general street driving and another for a more performance-oriented presentation, but the first priority is always the proper size on the proper axle. Load figures, sidewall style, and wheel compatibility can help narrow the final choice.
What sidewall styles are available for 2021 Mercedes-Benz CLS450 tires?
The available tires for the 2021 Mercedes-Benz CLS450 use a blackwall sidewall style across the listed 19-inch and 20-inch fitments. That gives the car a clean modern appearance that suits the CLS450's contemporary luxury and performance-oriented character without introducing a traditional collector-style sidewall treatment.
Since the sidewall look stays consistent, most of the decision shifts to tire series, brand, and fitment details rather than visual sidewall variation. Buyers who are replacing only two tires should still confirm that the remaining pair matches the intended setup in size and general appearance so the staggered layout stays cohesive.
What brands offer tires for the 2021 Mercedes-Benz CLS450?
BFGoodrich and Nitto offer tires for the 2021 Mercedes-Benz CLS450 in the covered sizes. Depending on the exact fitment, choices include BFGoodrich g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A, along with Nitto NT555 G2 in several of the staggered front and rear sizes.
Brand alone should not drive the decision. The better approach is to confirm the car's wheel diameter and axle position first, then compare which series are actually available in that exact size. Once the correct size is settled, details such as rim-width range, load information, and intended driving use become more useful.
Restoration & Appearance
Which tire should I choose for a period-style 2021 Mercedes-Benz CLS450?
A period-style approach for a 2021 Mercedes-Benz CLS450 still begins with the correct staggered modern radial sizes for the wheel package already on the car. Since the available fitments are blackwall radials, the appearance stays true to the car's contemporary luxury-performance era rather than shifting toward a vintage sidewall look.
The most appropriate visual choice usually comes from staying with the proper 19-inch or 20-inch front-and-rear pairing and selecting a tire series that suits how the car is used. Keeping the overall presentation consistent across both axles matters more here than chasing a restoration theme associated with much older vehicles.
Does correct tire fitment matter for a 2021 Mercedes-Benz CLS450 restoration or preservation project?
Correct tire fitment matters because the 2021 Mercedes-Benz CLS450 relies on a specific staggered layout, with narrower tires in front and wider tires in the rear. Using the proper 19-inch or 20-inch size pair helps preserve the car's intended stance, wheel-to-tire proportion, and overall visual balance.
Preservation-minded owners should pay attention to wheel diameter, axle position, and consistent sidewall appearance before replacing part of a set. Even on a newer collector candidate, a mismatched tire size can change the look of the car quickly. Keeping records of the wheel package already installed can make future tire replacement much easier.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2021 Mercedes-Benz CLS450?
Yes, modifications can affect tire fitment on a 2021 Mercedes-Benz CLS450, especially because the car uses a staggered setup with separate front and rear sizes. Aftermarket wheels, changes in wheel width, altered offsets, suspension lowering, or body modifications can all change how much room is available around the tire.
A car that no longer has its original wheel setup should be checked carefully before replacement tires are chosen. Verifying wheel diameter is only the first step. Clearance at full steering lock, rear fender space, and the relationship between the tire and the suspension should also be reviewed before mounting a new set.
What should I inspect before driving a 2021 Mercedes-Benz CLS450 on new tires?
Before driving a 2021 Mercedes-Benz CLS450 on new tires, confirm that the correct front and rear sizes were installed for the wheel package on the car. Tire pressure, valve condition, wheel condition, and basic mounting quality all deserve a quick review before the car goes back into normal road use.
A short follow-up inspection is also worthwhile after the first miles. Look for any sign of rubbing, uneven seating, vibration, or unexpected air loss, especially on a staggered setup where the front and rear sizes differ. Catching a small fitment or installation issue early can prevent unnecessary wear and drivability problems.
How often should tires on a 2021 Mercedes-Benz CLS450 be inspected?
Tires on a 2021 Mercedes-Benz CLS450 should be inspected regularly for pressure loss, tread wear, sidewall damage, and any signs of uneven wear between the front and rear axles. Because the car uses staggered sizing, a problem at one end of the car may not appear the same way at the other end.
A visual check before longer drives is a sensible habit, and stored or lightly used cars should not be ignored simply because they cover fewer miles. Heat, age, and inactivity can still affect tire condition. Periodic inspection of the wheels, suspension condition, and alignment can also help protect the tire investment.
