The 2017 Mercedes-Benz Trucks GLA45 AMG blends compact crossover practicality with the sharper edge expected from AMG performance tuning, so tire choice has a direct effect on both stance and road manners. For this exact model, the main fitment question is not construction, since both supported sizes are radial, but whether the vehicle is on 19-inch or 20-inch wheels. That means choosing between 235/45R19 and 235/40R20, two close overall-diameter sizes with different rim diameters and sidewall profiles. The right selection starts with confirming the wheel setup already on the vehicle, then matching the tire to its intended use, ride preference, and overall appearance.
Which Tire Size Is Right for The 2017 Mercedes-Benz Trucks GLA45 AMG
Two primary tire sizes apply to the 2017 Mercedes-Benz Trucks GLA45 AMG, and both are radial fitments tied to different wheel diameters. The first step is confirming whether the vehicle is equipped with 19-inch or 20-inch wheels, since that determines whether 235/45R19 or 235/40R20 is appropriate. Once wheel diameter is confirmed, the decision shifts to sidewall profile, ride character, and the exact tire option that best suits the vehicle’s setup.
235/40R20 is a metric radial size where 235 identifies the nominal section width in millimeters, 40 is the aspect ratio, R denotes radial construction, and 20 is the wheel diameter in inches. On the 2017 Mercedes-Benz Trucks GLA45 AMG, this size pairs a shorter sidewall with a 20-inch rim, giving it a more low-profile presentation than the 19-inch alternative. That makes wheel confirmation especially important before replacement. This size is the one to evaluate when the vehicle is already equipped with 20-inch wheels and the goal is to maintain that wheel-and-tire proportion.
235/45R19 is a metric radial size with a 235-millimeter nominal section width, a 45-series aspect ratio, radial construction, and a 19-inch rim diameter. For the 2017 Mercedes-Benz Trucks GLA45 AMG, it delivers nearly the same overall diameter as the 20-inch option, but it does so with a taller sidewall on a smaller wheel. That distinction matters for replacement because the tire must match the actual wheel diameter on the vehicle. This is the correct size to consider when the GLA45 AMG is running 19-inch wheels and the existing setup is being retained.
Sub-model fitment is straightforward here because the covered 4Matic configuration uses the same two radial tire sizes already associated with the model. What matters most is confirming which wheel diameter is on the vehicle, since the tire choice depends on 19-inch versus 20-inch rims rather than a different trim-specific construction.
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2017 Mercedes-Benz Trucks GLA45 AMG 4Matic
The 2017 Mercedes-Benz Trucks GLA45 AMG 4Matic uses the same two radial fitments associated with this model, so the key distinction is wheel diameter rather than a separate sub-model-only tire size. Tire selection comes down to confirming whether the vehicle is on 19-inch or 20-inch wheels and then choosing a tire that matches that setup cleanly.
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.
Frequently Asked Questions
These FAQs focus on the tire sizes used on the 2017 Mercedes-Benz Trucks GLA45 AMG, how the 19-inch and 20-inch fitments differ, and what to check before replacing tires on a performance-oriented crossover.
Tire Size & Fitment
What tire size fits a 2017 Mercedes-Benz Trucks GLA45 AMG?
The 2017 Mercedes-Benz Trucks GLA45 AMG uses two primary tire sizes: 235/45R19 and 235/40R20. Both are radial metric sizes, and both apply to the GLA45 AMG 4Matic, so the correct choice depends on which wheel diameter is currently on the vehicle.
The important next step is checking the wheel itself rather than guessing by appearance. A 19-inch wheel requires 235/45R19, while a 20-inch wheel requires 235/40R20. Even though the two sizes are close in overall diameter, they are not interchangeable without matching the tire to the actual rim diameter and confirming clearance on the vehicle’s current setup.
What size rim does a 2017 Mercedes-Benz Trucks GLA45 AMG use?
A 2017 Mercedes-Benz Trucks GLA45 AMG can use either a 19-inch or 20-inch rim, depending on which of its two supported tire sizes is fitted. The 235/45R19 tire mounts on a 19-inch rim, while the 235/40R20 tire mounts on a 20-inch rim.
That makes wheel-diameter verification the first fitment check before buying replacement tires. Reading the size on the current tire sidewall is usually the quickest way to confirm it, but the wheel itself should also be checked if the vehicle has had previous wheel changes. Matching the tire to the rim diameter is essential before considering any other specification.
Why does the 2017 Mercedes-Benz Trucks GLA45 AMG have more than one tire size?
The 2017 Mercedes-Benz Trucks GLA45 AMG has more than one tire size because it supports two different wheel diameters. The fitments are 235/45R19 for 19-inch wheels and 235/40R20 for 20-inch wheels, both in radial construction and both tied to the same model and 4Matic configuration.
The two sizes are close in overall diameter, but they use different sidewall proportions to suit different wheel sizes. That means tire replacement starts with identifying the wheel diameter already on the vehicle, not simply choosing the size that looks familiar. Any GLA45 AMG with aftermarket wheels or prior modifications should be checked carefully before replacing tires.
Choosing the Right Tire
What should I consider when choosing a 235/45R19 or 235/40R20 tire for a 2017 Mercedes-Benz Trucks GLA45 AMG?
Start with the correct size for the wheel currently on the vehicle. The 2017 Mercedes-Benz Trucks GLA45 AMG uses either 235/45R19 or 235/40R20, both in radial construction, so the first decision is always whether the vehicle has 19-inch or 20-inch rims.
After that, compare tires within the correct size based on intended use, sidewall profile preference, and compatibility with the vehicle’s existing wheel and suspension setup. Since the two sizes are close in overall diameter but not the same rim diameter, a buyer should confirm wheel size, inspect for any aftermarket changes, and keep the replacement tire aligned with the vehicle’s present configuration.
How do I choose between the available 2017 Mercedes-Benz Trucks GLA45 AMG tire sizes?
Choosing between the two supported sizes is not a matter of preference alone, because each one belongs to a different wheel diameter. A 2017 Mercedes-Benz Trucks GLA45 AMG on 19-inch wheels uses 235/45R19, while one on 20-inch wheels uses 235/40R20.
The practical difference is sidewall profile as well as rim size. The 20-inch fitment uses a lower-profile tire, while the 19-inch fitment uses a slightly taller sidewall with a smaller wheel. The correct path is to match the tire to the installed wheel, then evaluate how the vehicle is used and whether its suspension, alignment, and clearance conditions remain close to stock.
What rim-fitment details matter when choosing tires for a 2017 Mercedes-Benz Trucks GLA45 AMG?
Rim diameter is the most important rim-fitment detail on the 2017 Mercedes-Benz Trucks GLA45 AMG because its supported tire sizes are split between 19-inch and 20-inch wheels. The tire must match the wheel diameter exactly: 235/45R19 for 19-inch wheels and 235/40R20 for 20-inch wheels.
Beyond diameter, the buyer should also make sure the wheel setup has not changed from a previous owner’s modifications. Wheel width, offset, and suspension changes can influence how a tire sits in the wheel opening and how much steering or fender clearance remains. That is especially worth checking on a performance crossover where wheel packages are often changed for appearance.
Restoration & Appearance
Does correct tire fitment matter for the appearance of a 2017 Mercedes-Benz Trucks GLA45 AMG?
Yes, correct tire fitment has a visible effect on the appearance of a 2017 Mercedes-Benz Trucks GLA45 AMG because the model supports two different wheel-and-tire combinations. A 235/45R19 and a 235/40R20 have similar overall diameter, but the sidewall proportions and wheel presentation are different enough to change the vehicle’s visual balance.
Keeping the vehicle on the size intended for its current wheel preserves the relationship between tire sidewall and rim diameter. That matters if the goal is to maintain a clean, well-sorted look rather than mixing mismatched sizes. On a later performance vehicle like this one, appearance and proper fitment tend to go hand in hand.
How does tire construction affect the appearance of a restored 2017 Mercedes-Benz Trucks GLA45 AMG?
Tire construction is straightforward on a 2017 Mercedes-Benz Trucks GLA45 AMG because both supported primary sizes are radial. The visual difference here comes less from bias-ply versus radial and more from whether the vehicle is on the 19-inch 235/45R19 fitment or the 20-inch 235/40R20 fitment.
For an owner trying to keep the vehicle looking properly assembled, matching the tire to the installed wheel package is the key decision. The 20-inch setup presents a lower-profile look, while the 19-inch setup carries slightly more sidewall. A restoration-minded buyer should focus on preserving the intended wheel-and-tire proportion rather than changing construction type.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2017 Mercedes-Benz Trucks GLA45 AMG?
Yes, modifications can affect tire fitment on a 2017 Mercedes-Benz Trucks GLA45 AMG even when the replacement tire uses one of the correct factory-supported sizes. Aftermarket wheels, altered offsets, lowering changes, suspension work, or body modifications can all change the space available around the tire.
That means a modified vehicle should be checked more carefully than one on its original wheel setup. Confirm the actual wheel diameter first, then inspect inner clearance, fender clearance, and steering travel before replacing tires. A size that belongs on the model in general still needs to suit the wheel and suspension combination currently installed on that specific vehicle.
What should I inspect before driving a 2017 Mercedes-Benz Trucks GLA45 AMG on new tires?
Before driving a 2017 Mercedes-Benz Trucks GLA45 AMG on new tires, verify that the tire size matches the wheel diameter and inspect the wheels themselves for damage or prior repairs. It is also smart to check alignment condition, valve stems, and the basic condition of brakes and suspension components.
Once the new tires are mounted, keep an eye on inflation pressure, listen for rubbing, and make sure there is no contact at full steering lock or over suspension movement. Early inspection matters most when the vehicle has aftermarket wheels or non-stock suspension parts, since those changes can affect clearance even when using a supported tire size.
What should I check before a longer drive in a 2017 Mercedes-Benz Trucks GLA45 AMG?
Before a longer drive, check that the 2017 Mercedes-Benz Trucks GLA45 AMG is on the correct tire size for its wheels, then inspect tread condition, inflation pressure, and the sidewalls for cuts, bulges, or visible cracking. A quick walk-around can also reveal uneven wear that may point to alignment or suspension issues.
Longer trips put more heat and sustained load into the tires, so small problems become easier to notice. It is wise to recheck pressure when the tires are cold, confirm there is no slow air loss, and pay attention to vibration or pull once underway. On a performance-oriented vehicle, those checks help protect both ride quality and fitment integrity.
