The 2008 Mercedes-Benz CLK550 sits in the later years of the CLK line, blending grand touring comfort with the sharper stance and power expected from a V8 Mercedes coupe or cabriolet of the period. It is a modern performance-oriented application, and its tire fitment reflects that with staggered radial sizes rather than a one-size setup at all four corners. Front tires are 225/45R17 or 225/40R18, while the rear uses 245/40R17 or 255/35R18. That makes wheel diameter, front-to-rear positioning, and tire series especially important when choosing replacements, whether the goal is preserving the car's original character or matching a modified wheel package correctly.
Which Tire Size Is Right for The 2008 Mercedes-Benz CLK550
The 2008 Mercedes-Benz CLK550 uses four primary tire sizes, split between front and rear positions and tied to either 17-inch or 18-inch wheels. The first step is confirming wheel diameter and whether the car is using the 17-inch or 18-inch staggered setup, because the front and rear sizes are different and should be matched to the correct axle before comparing brands, sidewall treatments, or tire series.
225/40R18 is a metric radial size with a 225 millimeter section width, a 40-series profile, radial construction, and fitment on an 18-inch wheel. On the 2008 Mercedes-Benz CLK550, this size serves the front position in the 18-inch staggered setup, so it should be paired with the corresponding rear size rather than treated as a four-corner fitment. Available choices are centered on blackwall radial performance tires from BFGoodrich and Nitto across series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2. This size is the one to evaluate when the car already wears 18-inch front wheels and the goal is keeping the correct front-side profile and stance.
225/45R17 is a metric radial size that uses a 225 millimeter section width, a 45-series aspect ratio, and a 17-inch rim diameter. For the 2008 Mercedes-Benz CLK550, it is the front tire size in the 17-inch staggered arrangement, making it part of a matched front-and-rear combination rather than a universal fitment across the car. Product choice is broader here, with blackwall options from BFGoodrich and Nitto plus Pro-Trac Street Pro III versions in raised white letter and redline sidewall styles. This is the right size to review when the CLK550 retains 17-inch front wheels and the buyer wants to compare appearance as well as series and rim-width compatibility.
245/40R17 is a metric radial size with a 245 millimeter section width, a 40-series profile, and fitment on a 17-inch wheel. On the 2008 Mercedes-Benz CLK550, this is the rear tire used with the 17-inch staggered setup, so its role is to complement the 225/45R17 front size rather than replace it. The available selection focuses on blackwall performance radials from BFGoodrich, including g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A. This size matters most when confirming the rear axle fitment on a 17-inch car and comparing load capacity, series character, and wheel-width suitability before replacement.
255/35R18 is a metric radial size that combines a 255 millimeter section width, a 35-series profile, and an 18-inch rim diameter. For the 2008 Mercedes-Benz CLK550, it is the rear tire in the 18-inch staggered package, giving the car its wider rear fitment and lower-profile look relative to the matching front size. Available products are blackwall radial performance tires from BFGoodrich and Nitto, including g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2. This is the size to check when the CLK550 has 18-inch rear wheels and the buyer needs the correct rear fitment to maintain the intended front-to-rear balance.
Fitment on the 2008 Mercedes-Benz CLK550 is straightforward once the front and rear positions are separated, but it still matters to verify which wheel package is on the car. The covered front sub-model uses one of two front sizes, while the rear sub-model uses the matching rear sizes for the corresponding 17-inch or 18-inch staggered setup.
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2008 Mercedes-Benz CLK550 Base Front
The 2008 Mercedes-Benz CLK550 Base Front uses either a 225/45R17 or 225/40R18 radial tire, depending on whether the car has the 17-inch or 18-inch wheel setup. Tire selection here starts with confirming wheel diameter, then comparing available blackwall, raised white letter, or redline options where they apply.
The 2008 Mercedes-Benz CLK550 Base Rear uses the matching rear half of the staggered fitment, either 245/40R17 or 255/35R18 radial tires. The key is pairing the rear size to the correct wheel diameter and front tire setup so the car keeps the intended axle-to-axle balance and clearance.
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 2008 Mercedes-Benz CLK550 Tires for Sale
Available 2008 Mercedes-Benz CLK550 tires span BFGoodrich, Nitto, and Pro-Trac options across the 17-inch and 18-inch staggered sizes. Buyers can compare blackwall performance radials in several g-Force and NT555 G2 series, with raised white letter and redline choices appearing in 225/45R17.
Common 2008 Mercedes-Benz CLK550 tire questions usually center on the staggered front and rear sizes, 17-inch versus 18-inch wheel setups, available radial tire styles, and what to inspect before putting the car back into regular road use.
Tire Size & Fitment
What tire size fits a 2008 Mercedes-Benz CLK550?
The 2008 Mercedes-Benz CLK550 uses a staggered radial setup rather than the same tire size at all four corners. Front fitments are 225/45R17 or 225/40R18, and rear fitments are 245/40R17 or 255/35R18. The 17-inch sizes belong together, and the 18-inch sizes belong together.
The main step is confirming which wheel diameter is actually on the car before choosing tires. A CLK550 with 17-inch wheels should use the matching 17-inch front and rear sizes, while an 18-inch car should use the corresponding 18-inch pair. Front and rear positions should also be checked separately because the car does not use a square fitment.
What size rim does a 2008 Mercedes-Benz CLK550 use?
A 2008 Mercedes-Benz CLK550 uses either 17-inch or 18-inch rims, depending on the wheel setup on the car. The 17-inch arrangement pairs 225/45R17 front tires with 245/40R17 rear tires, while the 18-inch arrangement pairs 225/40R18 front tires with 255/35R18 rear tires.
Rim diameter should be confirmed before anything else because it determines which tire sizes are even under consideration. It also helps to verify wheel width, especially if the car has aftermarket wheels, since available tires in these sizes carry different rim-width ranges. That check is important before comparing series, sidewall style, or load-related specifications.
Why does the 2008 Mercedes-Benz CLK550 have more than one tire size?
The 2008 Mercedes-Benz CLK550 has more than one tire size because it uses a staggered fitment, with narrower tires in front and wider tires in the rear, and it was offered with both 17-inch and 18-inch wheel diameters. That creates four primary sizes across the two wheel packages.
The practical result is that tire replacement starts with identifying both axle position and wheel diameter. A front tire size should not be selected for the rear, and a 17-inch tire should not be chosen for an 18-inch wheel. On cars that have been modified, it is also wise to verify the actual wheel dimensions instead of assuming the original setup is still in place.
Choosing the Right Tire
What should I consider when choosing a tire for a 2008 Mercedes-Benz CLK550?
Start with the correct front or rear size and the correct wheel diameter, because the 2008 Mercedes-Benz CLK550 uses a staggered setup. After that, compare construction details that matter within the size, including rim-width compatibility, load figures where stated, and the character of the available radial tire series.
Appearance and use also shape the choice. Some sizes are offered only as blackwalls, while 225/45R17 adds raised white letter and redline options for a different visual effect. A buyer replacing one tire should also consider whether the remaining tires match in size family and general tread type so the car keeps a balanced look and road feel.
What sidewall styles are available for 2008 Mercedes-Benz CLK550 tires?
Blackwall is the dominant sidewall style across the 2008 Mercedes-Benz CLK550 tire sizes. In 225/45R17, there are also Pro-Trac Street Pro III options with raised white letter and redline sidewalls, giving that front 17-inch size a broader appearance range than the other fitments.
Sidewall style should still be chosen within the correct size and axle position. A blackwall presentation tends to suit the car's modern grand touring look, while raised white letter or redline creates a more customized appearance. Owners using a 17-inch setup may want to consider how the front sidewall treatment coordinates with the rear tires so the staggered package looks intentional.
What brands offer tires for the 2008 Mercedes-Benz CLK550?
BFGoodrich, Nitto, and Pro-Trac all offer tires within the 2008 Mercedes-Benz CLK550 fitment range. BFGoodrich appears across all four sizes through several g-Force series, Nitto is available in selected 17-inch and 18-inch sizes through the NT555 G2 line, and Pro-Trac appears in 225/45R17.
Brand comparison makes the most sense after the correct size has been narrowed down. Some sizes have a wider mix of brands and sidewall treatments than others, while some rear fitments stay focused on blackwall performance radials. It also helps to compare rim-width requirements and any stated load figures so the chosen tire suits the car's actual wheel setup.
Restoration & Appearance
Which tire should I choose for a period-style 2008 Mercedes-Benz CLK550?
A period-style 2008 Mercedes-Benz CLK550 tire choice usually starts with keeping the car in its correct staggered size family and wheel diameter, either the 17-inch or 18-inch arrangement. Since this is a modern radial application, the visual decision is less about vintage construction and more about maintaining a clean, era-appropriate performance look.
Blackwall tires are the most natural fit for that approach across the CLK550 range. On 17-inch front fitment, raised white letter and redline options are available, but those create a more customized presentation than a typical late-2000s Mercedes appearance. When originality matters closely, compare the car against period photos, dealer literature, or marque-specific reference material.
Does correct tire fitment matter for a 2008 Mercedes-Benz CLK550 restoration?
Correct tire fitment matters on a 2008 Mercedes-Benz CLK550 restoration because the car uses different front and rear sizes and because the overall appearance is tied to the intended wheel diameter. Using the wrong axle size or mixing 17-inch and 18-inch fitments can quickly change the stance and visual balance.
It also affects how convincing the finished car looks. A restoration-minded owner should confirm the wheel set currently on the car, then match the front and rear tires to that package before deciding on brand or sidewall treatment. That keeps the project focused on proper proportions instead of forcing appearance compromises after the wheels and tires are mounted.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2008 Mercedes-Benz CLK550?
Yes, modifications can affect tire fitment on a 2008 Mercedes-Benz CLK550. The car already uses a staggered arrangement, so changes such as aftermarket wheels, different wheel widths, altered offsets, lowered suspension, or body modifications can influence which tire size clears properly at the front and rear.
A modified car should be checked more carefully than a stock one before replacement tires are selected. Confirm the actual wheel diameter and width, then inspect steering clearance, inner clearance, and fender clearance at normal ride height. That is especially important when choosing between the 17-inch and 18-inch fitments or when replacing only one axle at a time.
What should I inspect before driving a 2008 Mercedes-Benz CLK550 on new tires?
Before driving a 2008 Mercedes-Benz CLK550 on new tires, inspect tire pressure, wheel condition, valve stems, and the basic condition of the suspension and alignment-related components. It is also smart to confirm that the correct front and rear sizes were mounted in the proper positions and that each tire matches its wheel diameter.
A short initial check drive can reveal rubbing, vibration, pulling, or any mismatch in front-to-rear setup before the car is used more seriously. After that, recheck pressures and look over the sidewalls and tread for any signs of interference. On a car that has sat for long periods, a full inspection is worthwhile even when the tires are brand new.
How should tires on a collector-era 2008 Mercedes-Benz CLK550 be maintained?
Tires on a low-use 2008 Mercedes-Benz CLK550 should be maintained with regular pressure checks, routine visual inspection, and attention to age-related condition even when tread wear is low. Blackwall, raised white letter, and redline sidewalls should all be examined for cracking, cuts, bulges, or uneven wear before road use.
Storage conditions matter on a car that spends long periods parked. Keeping the vehicle away from prolonged sunlight, heat, moisture, and ozone sources can help preserve tire condition, and moving the car periodically can reduce long stationary loading. Before a longer drive, inspect both front and rear fitments carefully since the staggered setup uses different sizes on each axle.
