2020 Mercedes-Benz CLA45 AMG Tires

The 2020 Mercedes-Benz CLA45 AMG uses two tire sizes: 245/40R18 and 255/35R19, both in radial construction. The CLA45 AMG 4Matic can use either size, while the CLA45 AMG 4Matic w/AMG Dynamic Plus Pkg. uses 255/35R19.

That means the correct choice starts with confirming the exact sub-model and the wheel diameter currently on the car. An 18-inch wheel calls for 245/40R18, and a 19-inch wheel calls for 255/35R19. If the car has been changed from its original wheel setup, check the installed wheel size before comparing tire brands or series.

The 2020 Mercedes-Benz CLA45 AMG uses either an 18-inch or 19-inch rim, depending on the tire size and sub-model configuration. The 245/40R18 tire fits an 18-inch rim, and the 255/35R19 tire fits a 19-inch rim.

Rim diameter is the first fitment checkpoint because the tire must match the wheel exactly. Once diameter is confirmed, wheel width also deserves attention, especially on a performance car where tire series may have different approved rim-width ranges. Looking at the sidewall marking on the current tire or measuring the wheel directly helps prevent choosing the right tire size for the wrong wheel.

More than one tire size applies because the 2020 Mercedes-Benz CLA45 AMG was offered with different wheel configurations. The standard 4Matic setup can be found with either 245/40R18 or 255/35R19, while the 4Matic w/AMG Dynamic Plus Pkg. uses the 255/35R19 size.

That variation means tire selection is tied to how the car is equipped, not just to the model name alone. Buyers should confirm the exact sub-model and inspect the actual wheel diameter on the vehicle before replacing tires. This step matters even more on used performance cars, where aftermarket wheels or previous tire changes may no longer match the original configuration.

A 245/40R18 tire for a 2020 Mercedes-Benz CLA45 AMG should first match an 18-inch wheel, then be compared by intended use, tire series, and sidewall style. Available choices include blackwall performance radials from BFGoodrich, Nitto, and M&H Racemaster, along with Pro-Trac Street Pro III options in redline and RWL.

That mix creates a broader decision than simple fitment alone. Some owners may want a conventional blackwall performance look, while others may prefer a more distinctive sidewall treatment. Rim-width compatibility also matters in this size, so the wheel should be checked against the tire’s approved range before settling on a specific series or brand.

Sidewall style depends on tire size. In 245/40R18, available options include Blackwall, Redline, and RWL. In 255/35R19, the available choices are blackwall performance radials.

That means appearance options are wider on the 18-inch fitment than on the 19-inch setup. Buyers who want a more customized look may focus on the 245/40R18 range, while 255/35R19 choices stay closer to a conventional modern performance presentation. The sidewall style should always be selected after confirming the correct tire size and wheel diameter for the specific car.

Tires for the 2020 Mercedes-Benz CLA45 AMG are available from BFGoodrich, Nitto, M&H Racemaster, and Pro-Trac. Brand availability varies by size, with the 255/35R19 fitment centered on BFGoodrich and the 245/40R18 fitment offering the widest brand mix.

The brand decision should come after the fitment decision, not before it. Once the correct size is confirmed, the next useful comparison points are tire series, sidewall style, rim-width compatibility, and whether the tire is meant for street performance or a more specialized purpose. That approach keeps the search focused on the actual setup on the car.

A 2020 Mercedes-Benz CLA45 AMG is a modern performance car, so a period-style choice usually means staying with the proper modern radial size and selecting a sidewall presentation that suits the car’s look. The strongest appearance variation appears in 245/40R18, where blackwall, redline, and RWL options are available.

For a cleaner late-model AMG presentation, many owners will stay with blackwall performance radials. A redline or raised white letter tire can create a more customized visual effect, but that is an appearance choice rather than an originality claim. Matching the wheel diameter and preserving the intended stance of the car matter more than chasing a style that does not suit the setup.

Construction is straightforward on the 2020 Mercedes-Benz CLA45 AMG because the fitments here are all radial. That keeps the appearance question focused less on bias-ply versus radial shape and more on sidewall treatment, tire series, and whether the car is running the 18-inch or 19-inch wheel setup.

Visual impact comes from proportion and presentation. A blackwall keeps the look contemporary and restrained, while redline or RWL treatments in 245/40R18 push the car toward a more customized style. Owners trying to preserve a clean, model-appropriate appearance should start with the correct size and wheel diameter, then choose the sidewall treatment that best matches the rest of the car.

Yes, modifications can affect tire fitment on a 2020 Mercedes-Benz CLA45 AMG. Aftermarket wheels, altered wheel widths, suspension changes, or lowering can all change how a 245/40R18 or 255/35R19 tire sits in the wheelwell and how much clearance remains during steering and suspension travel.

A modified car should be checked as it actually sits rather than assumed to match stock dimensions. Wheel diameter is only one part of the equation; wheel width and offset also matter. Before installing new tires, inspect clearance at the strut, fender edge, and inner wheelhouse, especially if the car has already been changed from its original AMG wheel and suspension setup.

Before driving a 2020 Mercedes-Benz CLA45 AMG on new tires, inspect the wheel diameter, wheel condition, tire pressure, and basic clearance around the suspension and body. It also helps to confirm that all four tires match the intended fitment for the specific sub-model and wheel package on the car.

A quick road-use check should include looking for any rubbing at full steering lock, listening for unusual contact noises, and rechecking pressure after the tires have settled in. On a performance car, alignment condition also affects how the tires wear and behave. Catching a wheel, clearance, or alignment issue early helps the new tires wear more evenly and perform as expected.

Tires on a 2020 Mercedes-Benz CLA45 AMG should be inspected regularly, not just at replacement time. Pressure, tread condition, uneven wear, cuts, punctures, sidewall damage, and signs of air loss all deserve routine attention, especially on a car that may see enthusiastic road use.

A monthly visual check is a sensible baseline, with another inspection before longer trips or spirited driving. Performance-oriented tires can reveal alignment or suspension problems through shoulder wear or irregular tread patterns, so small changes should not be ignored. Keeping an eye on tire condition and inflation is one of the simplest ways to protect both handling quality and tire life.