The 2018 Mercedes-Benz SL63 AMG sits at the sharp end of the long-running SL lineage, blending grand touring comfort with serious AMG power in a low, wide roadster package. Tire choice matters here because the chassis depends on a staggered radial setup rather than a one-size arrangement. The front uses 255/35R19, while the rear can be fitted with either 285/30R19 or 285/30R20 depending on wheel setup. That creates meaningful decisions around rim diameter, tire series, and even sidewall presentation, including blackwall, raised white letter, and redline options at the rear. Before choosing, confirm the car's actual front and rear wheel package and decide whether appearance, replacement matching, or road-use priorities come first.
Which Tire Size Is Right for The 2018 Mercedes-Benz SL63 AMG
The 2018 Mercedes-Benz SL63 AMG uses three primary tire sizes across a staggered front-and-rear setup, and the key distinction is at the rear. Front fitment stays on a 19-inch rim, while the rear may use either a 19-inch or 20-inch tire depending on the wheel package. Before selecting a tire, confirm the car's actual rear rim diameter so the front and rear sizes are matched to the wheels currently on the vehicle.
In 255/35R19, the 255 identifies nominal section width in millimeters, the 35 is the aspect ratio, R indicates radial construction, and 19 is the wheel diameter in inches. This is the front tire size for the 2018 Mercedes-Benz SL63 AMG and is built around a modern low-profile radial format. Available choices in this size come from BFGoodrich across the g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series, all with blackwall styling. It is the size to evaluate when the goal is matching the SL63 AMG's front-wheel fitment to the correct 19-inch setup.
In 285/30R19, the 285 is the nominal section width in millimeters, the 30 is the aspect ratio, R marks radial construction, and 19 designates a 19-inch rim. On the 2018 Mercedes-Benz SL63 AMG, this is one of the rear fitment sizes used with a 19-inch rear wheel. Its low-profile radial format suits the staggered rear setup, so it should be chosen only after confirming the car has the correct rear rim diameter. This size matters when the SL63 AMG retains a 19-inch rear wheel rather than the alternate 20-inch configuration.
In 285/30R20, the 285 denotes nominal section width in millimeters, the 30 is the aspect ratio, R signifies radial construction, and 20 is the wheel diameter in inches. This is the alternate rear tire size for the 2018 Mercedes-Benz SL63 AMG when the car is equipped with a 20-inch rear wheel. Available products include blackwall and more appearance-driven sidewall treatments such as RWL and redline, with options from Nitto and Pro-Trac in the Street Pro III and NT555 G2 series. It is the rear size to consider when wheel diameter and tire presentation both influence the decision.
Fitment on the 2018 Mercedes-Benz SL63 AMG is straightforward at the front and more configuration-sensitive at the rear. Checking whether the question is front or rear fitment matters because the front uses one size, while the rear can use two different sizes tied to wheel diameter.
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2018 Mercedes-Benz SL63 AMG Base Front
The 2018 Mercedes-Benz SL63 AMG Base Front uses a single 255/35R19 radial fitment on a 19-inch wheel. Tire selection here is less about size variation and more about choosing the right series and specifications for the car's front-end setup.
The 2018 Mercedes-Benz SL63 AMG Base Rear can use either 285/30R19 or 285/30R20 radial tires, depending on the rear wheel package. That makes rear wheel confirmation the first step, followed by deciding whether a blackwall, raised white letter, or redline presentation suits the car.
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 SL63 AMG Tires for Sale
Available 2018 Mercedes-Benz SL63 AMG tire choices center on modern radial fitments from BFGoodrich, Nitto, and Pro-Trac. Depending on size, buyers can compare g-Force and Street Pro III series options along with blackwall, raised white letter, and redline sidewall treatments.
These FAQs focus on the 2018 Mercedes-Benz SL63 AMG's staggered tire sizing, 19-inch versus 20-inch rear fitment, product selection, sidewall choices, and the wheel, suspension, and maintenance checks that matter before road use.
Tire Size & Fitment
What tire size fits a 2018 Mercedes-Benz SL63 AMG?
The 2018 Mercedes-Benz SL63 AMG uses a staggered radial setup rather than the same tire size at all four corners. Front fitment is 255/35R19, while rear fitment can be either 285/30R19 or 285/30R20 depending on the wheel configuration installed on the car.
That means the first step is confirming whether the tire is for the front or rear, then checking the rear wheel diameter before ordering a replacement. A front 19-inch fitment does not make the rear automatically 19-inch as well, so matching the tire to the actual wheel package on the vehicle is essential.
What size rim does a 2018 Mercedes-Benz SL63 AMG use?
The 2018 Mercedes-Benz SL63 AMG uses 19-inch front rims with its 255/35R19 front tire size. At the rear, the car may use either a 19-inch rim with 285/30R19 tires or a 20-inch rim with 285/30R20 tires, depending on configuration.
Rim diameter is the critical fitment point on this SL63 AMG because the rear is not limited to one wheel size. Checking the stamping on the wheel, the current tire sidewall, or the car's existing rear setup helps prevent mixing a 19-inch tire with a 20-inch wheel or vice versa.
Why does the 2018 Mercedes-Benz SL63 AMG have more than one tire size?
The 2018 Mercedes-Benz SL63 AMG has more than one tire size because it uses a staggered arrangement and the rear fitment can vary by wheel diameter. The front stays at 255/35R19, while the rear may be 285/30R19 or 285/30R20 depending on the wheel package.
That combination reflects two separate fitment questions: front-versus-rear position and 19-inch-versus-20-inch rear wheel choice. Anyone replacing tires should identify both before comparing products, since overall tire selection, available brands, and sidewall treatments change once the rear wheel diameter changes.
Choosing the Right Tire
What should I consider when choosing a tire for a 2018 Mercedes-Benz SL63 AMG?
Start with the exact position and size: 255/35R19 for the front, and either 285/30R19 or 285/30R20 for the rear. From there, compare radial construction details, wheel compatibility, tire series, and whether the goal is straightforward replacement, a more aggressive look, or a matched appearance across the car.
The available choices differ by brand and by size, so the best comparison is not just tread style but also the actual wheel package on the vehicle. A careful selection should account for front and rear matching, sidewall appearance, and the way the car is used rather than choosing by size alone.
What sidewall styles are available for 2018 Mercedes-Benz SL63 AMG tires?
Sidewall style depends on tire size. The 255/35R19 front options are available in blackwall, while the 285/30R20 rear options include blackwall, RWL, and redline treatments, giving the rear of the 2018 Mercedes-Benz SL63 AMG more visual variety than the front fitment.
That matters if the car's presentation is part of the decision, especially on a vehicle where wheel and tire appearance are highly visible. Matching sidewall style to the intended look can be just as important as brand or series, but the first check is still making sure the sidewall treatment is offered in the correct rear size.
What brands offer tires for the 2018 Mercedes-Benz SL63 AMG?
Tires for the 2018 Mercedes-Benz SL63 AMG are available from BFGoodrich, Nitto, and Pro-Trac across the applicable sizes shown here. BFGoodrich appears in the 255/35R19 front fitment, while Nitto and Pro-Trac are available in 285/30R20 for the rear configuration that uses a 20-inch wheel.
Brand choice should be considered alongside the exact tire size, tire series, and sidewall treatment rather than in isolation. Since availability differs by position and rear wheel diameter, a buyer comparing brands should first confirm whether the car needs front replacement, 19-inch rear replacement, or 20-inch rear replacement.
Restoration & Appearance
Which tire should I choose for a period-style 2018 Mercedes-Benz SL63 AMG?
A period-style choice for a 2018 Mercedes-Benz SL63 AMG starts with keeping the correct staggered sizing and wheel diameter already on the car. Front fitment remains 255/35R19, while the rear should stay with either 285/30R19 or 285/30R20, depending on the wheel package being retained.
Appearance then comes from the tire's series and sidewall presentation rather than changing to an unrelated size. Blackwall keeps a more understated modern look, while RWL or redline on applicable 285/30R20 rear tires creates a more customized presentation, so the right choice depends on whether the car is being preserved or visually personalized.
How does tire construction affect the appearance of a restored 2018 Mercedes-Benz SL63 AMG?
On a 2018 Mercedes-Benz SL63 AMG, construction is straightforward because the fitments here are modern radial tires. The appearance difference comes less from bias-ply-versus-radial concerns and more from sidewall profile, tread character, and whether the selected rear tire is a blackwall, raised white letter, or redline design.
That makes proper sizing especially important to the finished look, since the SL63 AMG's low-profile staggered setup is part of its visual stance. Keeping the correct front and rear relationship preserves that appearance better than forcing a different format, and sidewall treatment should complement the car's wheels and intended presentation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Mercedes-Benz SL63 AMG?
Yes, modifications can affect tire fitment on a 2018 Mercedes-Benz SL63 AMG, especially because the car already uses a staggered setup with more than one possible rear size. Aftermarket wheels, altered offsets, suspension changes, or ride-height adjustments can all change how a 255/35R19 front or 285/30 rear tire sits in the chassis.
That is why replacement should begin with the actual wheel dimensions and current front-and-rear setup on the car, not just the model name. Clearance at the fender, inner wheelhouse, and steering range should be checked any time the SL63 AMG has been modified or the wheel package no longer matches stock sizing.
What should I inspect before driving a 2018 Mercedes-Benz SL63 AMG on new tires?
Before driving a 2018 Mercedes-Benz SL63 AMG on new tires, inspect wheel condition, confirm the front and rear sizes match the wheels installed, and check that each tire is seated and inflated properly. It is also wise to look for any rubbing risks, especially at the rear where both 19-inch and 20-inch fitments exist.
A careful road-use check should also include alignment condition, suspension wear, and enough clearance through steering and suspension travel. Since this car depends on a low-profile staggered setup, small problems become more noticeable, so catching vibration, uneven clearance, or air loss early helps protect both the tires and the driving experience.
How often should tires on a 2018 Mercedes-Benz SL63 AMG be inspected?
Tires on a 2018 Mercedes-Benz SL63 AMG should be inspected regularly, not just when tread looks worn. Low-profile radial tires deserve routine checks for pressure, uneven wear, cuts, punctures, sidewall damage, and any signs of contact with suspension or body components, especially if the car is driven hard or stored for periods between outings.
A quick visual check before drives and a more thorough inspection at regular service intervals is a sensible approach. The staggered layout also means front and rear tires age and wear differently, so each position should be examined on its own rather than assuming the whole set is in the same condition.
