The 2018 Mercedes-Benz C63 AMG S sits at the sharp edge of the modern C-Class lineup, blending compact luxury-car proportions with serious V8 performance and chassis tuning. It is also a fitment-sensitive car, because tire size changes by body style, axle position, and in some rear applications, wheel diameter. This Mercedes-Benz C63 AMG S uses modern metric radial sizes including 245/35R19, 255/35R19, 265/35R19, 285/30R19, and 285/30R20. Available choices range from blackwall performance radials to rear 20-inch options in blackwall, raised white letter, and redline form. The key is matching the exact front or rear setup before comparing series, appearance, and wheel compatibility.
Which Tire Size Is Right for The 2018 Mercedes-Benz C63 AMG S
The 2018 Mercedes-Benz C63 AMG S uses five primary tire sizes, and the correct one depends first on body style and whether the tire is for the front or rear axle. Rear fitment can also involve either a 19-inch or 20-inch wheel, so confirming the exact sub-model and wheel diameter is the first step before comparing tires.
A 255/35R19 tire is a metric radial size with a 255-millimeter nominal section width, a 35-series profile, and fitment for a 19-inch wheel. On the 2018 Mercedes-Benz C63 AMG S, this size serves as a front fitment for the coupe and cabriolet, where modern radial construction matches the car's performance-oriented setup. Available choices here center on blackwall tires from BFGoodrich across g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series. This size is best evaluated by confirming the front axle application and making sure the wheel width matches the tire's intended range.
A 285/30R19 tire uses a 285-millimeter nominal section width, a very short 30-series profile, and a 19-inch rim diameter. On the 2018 Mercedes-Benz C63 AMG S, it appears as a rear size for certain coupe and cabriolet configurations, making it part of a staggered performance fitment rather than a universal all-around size. Its low-profile radial construction is consistent with the car's rear-axle grip and appearance requirements. This size should be chosen only after confirming that the car is running the 19-inch rear wheel rather than the alternate 20-inch rear setup.
A 285/30R20 tire keeps the same 285-millimeter nominal width and 30-series profile as its 19-inch counterpart, but it is built for a 20-inch wheel. On the 2018 Mercedes-Benz C63 AMG S, this is a rear fitment used on certain coupe and cabriolet applications, so wheel diameter matters as much as the size code itself. Product choice is broader here, with blackwall, raised white letter, and redline sidewall treatments available from Nitto and Pro-Trac. This size makes sense only after verifying that the rear wheel is actually a 20-inch setup and that the tire style suits the car's intended appearance.
A 245/35R19 tire is a metric radial with a 245-millimeter nominal section width, a 35-series aspect ratio, and a 19-inch rim diameter. On the 2018 Mercedes-Benz C63 AMG S, this size is used at the front on the sedan, where it works as part of a staggered front-to-rear arrangement rather than as a shared fitment across all body styles. Blackwall options are available from BFGoodrich and Nitto in several performance-focused series, including g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2. Choosing this size starts with confirming that the car is a sedan front application and not a coupe or cabriolet front setup.
A 265/35R19 tire combines a 265-millimeter nominal section width, a 35-series profile, and a 19-inch wheel diameter in modern radial construction. On the 2018 Mercedes-Benz C63 AMG S, this size is used at the rear on the sedan, pairing with the sedan's narrower front fitment instead of the wider rear sizes used on the coupe and cabriolet. Available blackwall choices include BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Phenom T/A, and Nitto NT555 G2. This size should be selected only after confirming the sedan rear position and checking wheel width against the intended tire specification.
Tire fitment on the 2018 Mercedes-Benz C63 AMG S varies by body style and by front or rear axle, so the exact configuration matters before a tire is chosen. Coupe and cabriolet models also add a rear wheel-diameter split, which makes wheel confirmation especially important on the back axle.
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2018 Mercedes-Benz C63 AMG S Cabriolet Front
The cabriolet front setup uses a 255/35R19 radial tire, matching the coupe front rather than the sedan front. That keeps the buying decision focused on selecting among available blackwall performance series and confirming the front wheel width before installation.
The cabriolet rear uses a 285/30 width and profile, but it can be paired with either a 19-inch or 20-inch wheel depending on the setup. That makes rear wheel diameter the critical checkpoint before comparing blackwall, raised white letter, or redline tire choices.
The coupe front fitment uses the same 255/35R19 radial size found on the cabriolet front. Tire selection then becomes a matter of choosing the preferred performance series and verifying that the front wheel specification matches the tire's approved range.
The coupe rear shares the same rear fitment pattern as the cabriolet, with 285/30 tires available on either a 19-inch or 20-inch wheel. Matching the tire to the actual rear wheel diameter is essential before comparing sidewall style and brand options.
The sedan front uses a narrower 245/35R19 radial tire than the coupe and cabriolet front applications. That difference matters when ordering replacements, because the correct front size should be matched to the sedan's staggered setup rather than assumed from another C63 AMG S body style.
The sedan rear uses 265/35R19, which is distinct from the wider rear fitments used on the coupe and cabriolet. Tire selection here is straightforward once the rear position is confirmed, with blackwall performance radials available in several established series.
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 2018 Mercedes-Benz C63 AMG S Tires for Sale
Available 2018 Mercedes-Benz C63 AMG S tires are all radial designs, with choices from BFGoodrich, Nitto, and Pro-Trac depending on size. Buyers can compare blackwall options across several performance series, while certain 285/30R20 rear fitments also offer raised white letter and redline sidewall treatments.
These FAQs focus on the exact tire sizes used on the 2018 Mercedes-Benz C63 AMG S, how front and rear fitment changes by sub-model, and what to compare when choosing tires for performance driving, appearance, and proper wheel match.
Tire Size & Fitment
What tire size fits a 2018 Mercedes-Benz C63 AMG S?
The 2018 Mercedes-Benz C63 AMG S uses several tire sizes rather than one universal fitment. Front sizes include 255/35R19 on the coupe and cabriolet and 245/35R19 on the sedan, while rear sizes include 265/35R19 on the sedan and 285/30R19 or 285/30R20 on the coupe and cabriolet rear.
The practical takeaway is that tire selection starts with identifying the body style and whether the tire is for the front or rear axle. Rear fitment on the coupe and cabriolet also requires confirming whether the car has a 19-inch or 20-inch wheel before comparing brands, tire series, or sidewall style.
What size rim does a 2018 Mercedes-Benz C63 AMG S use?
The 2018 Mercedes-Benz C63 AMG S uses both 19-inch and 20-inch rim diameters, depending on configuration. Most front fitments use 19-inch wheels, the sedan rear also uses a 19-inch wheel, and certain coupe and cabriolet rear applications can use either a 19-inch or 20-inch wheel with a 285/30 tire.
That makes rim diameter one of the first things to confirm before ordering a replacement tire, especially on the rear of a coupe or cabriolet. Reading the sidewall on the existing tire and verifying the actual wheel size helps prevent mixing a 19-inch tire with a 20-inch wheel or vice versa.
Do all 2018 Mercedes-Benz C63 AMG S sub-models use the same tire size?
No, the 2018 Mercedes-Benz C63 AMG S does not use the same tire size across all covered sub-models. The sedan uses 245/35R19 front and 265/35R19 rear, while the coupe and cabriolet use 255/35R19 front and either 285/30R19 or 285/30R20 at the rear.
That variation means a tire choice that is correct for one body style may not be correct for another, even within the same model year and model name. Matching the exact front or rear position and confirming wheel diameter on rear coupe and cabriolet applications keeps the staggered setup consistent.
Choosing the Right Tire
What should I consider when choosing a tire for a 2018 Mercedes-Benz C63 AMG S?
Start with the exact size for the vehicle's body style and axle position, because the 2018 Mercedes-Benz C63 AMG S uses different front and rear fitments and may use different rear wheel diameters. All available choices are radial tires, so the main decision moves to correct size, wheel match, tire series, and intended appearance.
Once the fitment is confirmed, compare details such as rim-width compatibility where stated, load figures where available, sidewall presentation, and the character of the tire series offered in that size. A sedan rear tire and a coupe rear tire should not be treated as interchangeable simply because both are performance-oriented radials.
What sidewall styles are available for 2018 Mercedes-Benz C63 AMG S tires?
Blackwall is the most common sidewall style available for the 2018 Mercedes-Benz C63 AMG S across its 19-inch front and rear fitments. On certain 285/30R20 rear applications, there are also raised white letter and redline options, creating a more customized visual presentation than the standard blackwall look.
Sidewall choice does not change the need to match the correct size and wheel diameter first. On a modern performance car like the C63 AMG S, appearance decisions make the most sense after the rear 20-inch application has been confirmed, since those specialty sidewall treatments are tied to that specific rear fitment.
What brands offer tires for the 2018 Mercedes-Benz C63 AMG S?
Tires for the 2018 Mercedes-Benz C63 AMG S are available from BFGoodrich, Nitto, and Pro-Trac, depending on size. BFGoodrich appears in several 19-inch sizes through g-Force series options, Nitto is available in both 19-inch and 20-inch applications, and Pro-Trac appears in the 285/30R20 rear size.
The useful comparison is not simply brand name, but which brand offers the exact fitment and style you want for your specific axle position. Some sizes are limited to blackwall choices, while the 285/30R20 rear application adds more appearance variety, so brand selection often follows the correct fitment rather than leading it.
Restoration & Appearance
Which tire should I choose for a period-style 2018 Mercedes-Benz C63 AMG S?
A period-style approach on a 2018 Mercedes-Benz C63 AMG S still begins with the exact modern radial size used by the car's body style and axle position. Since this is a late-model high-performance Mercedes-Benz, the closest period-appropriate look usually comes from staying with the correct staggered fitment and choosing a tire that preserves a clean, performance-oriented presentation.
Blackwall tires are the most natural match if the goal is to keep the car visually close to its original era rather than giving it a custom treatment. The key is to confirm front versus rear sizing and, on coupe or cabriolet rear applications, whether the wheel is 19 or 20 inches before narrowing the appearance choice.
How does tire construction affect the appearance of a restored 2018 Mercedes-Benz C63 AMG S?
Construction is straightforward on the 2018 Mercedes-Benz C63 AMG S because the applicable fitments are all radial. That means the appearance difference comes less from bias-ply-versus-radial choice and more from keeping the proper staggered modern profile, wheel diameter, and sidewall treatment that suit the car's original design era.
A low-profile blackwall radial generally maintains the most restrained OEM-era look, while raised white letter or redline rear options create a more customized presentation. On a modern AMG model, preserving the correct proportions between front and rear tires has a bigger visual effect than switching among brands within the same size category.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Mercedes-Benz C63 AMG S?
Yes, modifications can affect tire fitment on a 2018 Mercedes-Benz C63 AMG S even when the tire size looks correct on paper. Aftermarket wheels, altered offsets, suspension changes, lowering, or body modifications can change how a 245/35R19, 255/35R19, 265/35R19, 285/30R19, or 285/30R20 tire sits in the wheel opening.
A modified car should be checked for wheel width, brake clearance, steering clearance, and fender room before replacement tires are chosen. Rear applications deserve extra attention on coupe and cabriolet models because the correct choice already depends on confirming whether the car uses a 19-inch or 20-inch rear wheel.
What should I inspect before driving a 2018 Mercedes-Benz C63 AMG S on new tires?
Before road use, inspect the new tires for correct front and rear placement, proper inflation, secure valve stems, and clear sidewall-to-suspension and tread-to-fender clearance. On a 2018 Mercedes-Benz C63 AMG S, it is also important to confirm that the tire size matches the exact axle position and that rear wheel diameter is correct on coupe or cabriolet applications.
A careful walk-around after installation helps catch issues before they become expensive ones. It is smart to recheck pressure after the first drives and look for any signs of rubbing, uneven seating, or air loss, especially on a staggered performance car where front and rear tires are not interchangeable.
How often should tires on a 2018 Mercedes-Benz C63 AMG S be inspected?
Tires on a 2018 Mercedes-Benz C63 AMG S should be inspected regularly for pressure, tread condition, cuts, punctures, bulges, and sidewall damage. A staggered performance setup deserves consistent attention because the front and rear tires do different work, and the car may use different sizes and even different rear wheel diameters depending on configuration.
Routine checks are especially worthwhile before longer drives or after the car has been parked for extended periods. Inspecting for uneven wear can also reveal alignment or suspension issues early, and keeping an eye on the exact front and rear sizes helps avoid accidental rotation or replacement mistakes later.
