The 2020 GMC Trucks Acadia sits in the modern midsize SUV category, blending family-duty practicality with trim-specific personality that ranges from more everyday street use to a more rugged AT4 presentation. That matters at tire level, because this Acadia does not rely on one universal fitment across the lineup. Depending on sub-model, it uses 245/65R17, 255/65R17, 235/65R18, or 235/55R20 radial tires on 17-, 18-, or 20-inch rims. The main decision is confirming the exact trim and wheel diameter first, then comparing the available tire style and specification choices within the correct size. That approach helps keep replacement fitment aligned with the Acadia’s intended stance, clearance, and road use.
Which Tire Size Is Right for The 2020 GMC Trucks Acadia
Four tire sizes apply to the 2020 GMC Trucks Acadia, and they vary by sub-model and wheel diameter rather than representing one universal setup. The first step is confirming the exact trim and whether the vehicle has a 17-inch, 18-inch, or 20-inch rim. Once that is settled, the decision becomes choosing the correct radial size for that configuration and checking that the current wheel and vehicle setup still match it, especially if anything has been changed from stock.
235/55R20 is a metric radial size: 235 is the nominal section width in millimeters, 55 is the aspect ratio, R identifies radial construction, and 20 is the rim diameter in inches. On the 2020 GMC Trucks Acadia, this size belongs to 20-inch-wheel configurations rather than the full model range. It gives the Acadia a modern low-profile SUV tire format compared with the taller 17- and 18-inch fitments used on other trims. This is the size to evaluate when the vehicle already has 20-inch wheels and the goal is to keep the same rim diameter and overall fitment category.
255/65R17 is a metric radial size with a 255-millimeter nominal section width, a 65-series profile, and a 17-inch rim diameter. Within the 2020 GMC Trucks Acadia lineup, this size is tied to a specific 17-inch application rather than every trim. Available product coverage in this size includes a BFGoodrich All-Terrain T/A KO2 with raised white letter sidewall styling, which gives it a more rugged visual character than a plain highway-oriented replacement. It is the size to confirm when the Acadia has the corresponding 17-inch wheel setup and a buyer wants to preserve that broader, more truck-inspired tire presentation.
245/65R17 is a metric radial size that uses a 245-millimeter nominal section width, a 65-series profile, and a 17-inch wheel diameter. For the 2020 GMC Trucks Acadia, it is a separate 17-inch fitment from the wider 255/65R17, so the exact trim and wheel setup matter before choosing between them. Product availability in this size includes a BFGoodrich All-Terrain T/A KO2 with raised white letter styling, giving buyers a distinct all-terrain look within the proper diameter class. This size is worth confirming carefully when replacing tires on a 17-inch Acadia, since not every 17-inch setup uses the same width.
235/65R18 is a metric radial size in which 235 indicates nominal width in millimeters, 65 is the aspect ratio, and 18 is the wheel diameter in inches. On the 2020 GMC Trucks Acadia, this size serves 18-inch-wheel configurations and sits between the 17-inch and 20-inch fitments used elsewhere in the lineup. Its profile and rim pairing reflect a different trim-specific setup, so it should not be chosen simply because it looks close to another Acadia size. This is the right size to investigate when the vehicle is equipped with 18-inch wheels and the goal is to stay with the same fitment family.
Tire fitment on the 2020 GMC Trucks Acadia varies by sub-model, and some trims can appear with more than one size. Checking the exact trim is important because the Acadia uses three different rim diameters across the lineup, so tire selection starts with identifying the specific configuration on the vehicle.
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2020 GMC Trucks Acadia AT4
The 2020 GMC Trucks Acadia AT4 can use either a 235/55R20 radial or a 255/65R17 radial, so wheel diameter has to be confirmed before choosing a replacement. That makes this trim especially important to inspect in person, since the tire decision depends on whether the vehicle is currently on its 17-inch or 20-inch setup.
The 2020 GMC Trucks Acadia Denali uses the 235/55R20 radial size. Tire selection here centers on keeping the 20-inch fitment correct and verifying that the wheels on the vehicle still match that size if anything has been changed since new.
The 2020 GMC Trucks Acadia SL uses the 245/65R17 radial size. That points the buyer toward the 17-inch fitment family, where checking exact width and matching the tire to the current wheel setup matters more than comparing it loosely to other Acadia trim sizes.
The 2020 GMC Trucks Acadia SLE uses the 235/65R18 radial size. Tire choice for this trim is straightforward once the 18-inch wheel diameter is confirmed, with the main goal being a replacement that stays within the proper fitment range for that setup.
The 2020 GMC Trucks Acadia SLT can use either 235/55R20 or 235/65R18 radial tires, depending on its wheel package. That means the buyer should confirm the current rim diameter first, then compare tires only within the matching size rather than across both SLT fitment possibilities.
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 2020 GMC Trucks Acadia Tires for Sale
Available product coverage for the 2020 GMC Trucks Acadia centers on 17-inch fitments from BFGoodrich in the All-Terrain T/A KO2 series. These options use radial construction, raised white letter sidewalls, and distinct rim-width and load specifications that are worth comparing against the wheel setup already on the vehicle.
These FAQs focus on the 2020 GMC Trucks Acadia’s trim-specific tire sizes, wheel diameters, radial fitment, product-selection factors, and the checks that matter before replacement or road use.
Tire Size & Fitment
What tire size fits a 2020 GMC Trucks Acadia?
The 2020 GMC Trucks Acadia uses four different tire sizes across its sub-models: 245/65R17, 255/65R17, 235/65R18, and 235/55R20. All of them are radial sizes, and they are tied to specific trim and wheel combinations rather than applying universally across every Acadia.
The practical step is to confirm the exact sub-model and the wheel diameter already on the vehicle before choosing a replacement. AT4 and SLT can each appear with more than one size, so reading the current tire sidewall and checking the rim diameter is more reliable than assuming every 2020 Acadia uses the same setup.
What size rim does a 2020 GMC Trucks Acadia use?
A 2020 GMC Trucks Acadia can use 17-inch, 18-inch, or 20-inch rims depending on sub-model and tire size. The 245/65R17 and 255/65R17 fitments use 17-inch rims, 235/65R18 uses an 18-inch rim, and 235/55R20 uses a 20-inch rim.
That makes rim diameter one of the first things to verify before ordering tires. An Acadia with 20-inch wheels cannot use a 17-inch or 18-inch tire, even if another trim in the same model year does. Checking the current tire sidewall and wheel setup helps avoid mixing trim-level fitments that belong to different rim diameters.
Why does the 2020 GMC Trucks Acadia have more than one tire size?
The 2020 GMC Trucks Acadia has more than one tire size because different sub-models use different wheel and tire packages. SL uses 245/65R17, SLE uses 235/65R18, Denali uses 235/55R20, and AT4 and SLT can each use one of two sizes depending on configuration.
That variation means tire selection starts with trim identification, not just model year. It also means two Acadias parked side by side may both be correct while wearing different tire sizes. Buyers should match the replacement tire to the vehicle’s actual sub-model and installed wheel diameter instead of choosing by appearance alone.
Choosing the Right Tire
What should I consider when choosing a tire for a 2020 GMC Trucks Acadia?
Start with the correct size for the exact 2020 GMC Trucks Acadia sub-model and wheel diameter. This Acadia uses several radial sizes, so choosing the right tire begins with confirming whether the vehicle is on a 17-, 18-, or 20-inch setup and then selecting within that size rather than comparing across the whole lineup.
After size is confirmed, compare the tire’s intended character, rim-width compatibility, and load specifications where those details are available. A more rugged all-terrain product may suit one 17-inch application, while another Acadia may simply need to stay within its original street-oriented fitment category. Matching the tire to the vehicle’s actual use matters as much as matching the printed size.
What sidewall styles are available for 2020 GMC Trucks Acadia tires?
Among the currently covered 2020 GMC Trucks Acadia products, the visible sidewall style is RWL, or raised white letter. That appearance is present on the available 17-inch BFGoodrich All-Terrain T/A KO2 options and gives those tires a more pronounced truck and SUV look than a plain blackwall presentation.
Sidewall style is an appearance decision, but it should always come after confirming the correct Acadia size and wheel diameter. A sidewall treatment that looks right on an AT4-style setup may not be relevant to another trim or wheel package. The safest approach is to choose the correct fitment first, then decide whether that sidewall style matches the vehicle’s intended look.
What brands offer tires for the 2020 GMC Trucks Acadia?
The currently covered 2020 GMC Trucks Acadia tire options include BFGoodrich products in the 17-inch sizes. Those products are part of the All-Terrain T/A KO2 series and are available in 245/65R17 and 255/65R17, both using radial construction and raised white letter sidewalls.
Brand choice only matters after confirming that the size is right for the specific Acadia trim and wheel package. Since the model uses multiple fitments across the lineup, a buyer should not choose by brand name first and fitment second. Verifying size, rim diameter, and the vehicle’s intended use keeps the product comparison grounded in the correct application.
Restoration & Appearance
Does correct tire fitment matter for a 2020 GMC Trucks Acadia restoration or appearance refresh?
Yes. Even on a newer vehicle like the 2020 GMC Trucks Acadia, correct tire fitment affects how the SUV sits, fills the wheel openings, and presents visually. Because this model uses four different tire sizes across multiple trims, the right appearance starts with matching the correct size to the actual wheel diameter and sub-model.
An appearance refresh can still go off course if a tire from another Acadia trim is used simply because it seems close. Keeping the right 17-, 18-, or 20-inch fitment preserves the intended stance much better than guessing across the lineup. If originality matters closely, compare the current setup against trim-specific vehicle references before changing sizes.
How do sidewall style and tire type affect the appearance of a 2020 GMC Trucks Acadia?
Sidewall style and tire type can change the visual character of a 2020 GMC Trucks Acadia even when the size is correct. The available 17-inch BFGoodrich All-Terrain T/A KO2 options use raised white letter sidewalls, which create a more assertive, off-road-influenced look than a smoother, less prominent sidewall treatment.
That makes appearance a secondary but still important choice once fitment is confirmed. A more rugged sidewall may suit an AT4-style presentation, while another owner may prefer a subtler look if a different tire family is being considered in the proper size. The key is keeping the correct Acadia fitment first and using sidewall style to fine-tune the visual result.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2020 GMC Trucks Acadia?
Yes. Modifications can change how a tire fits on a 2020 GMC Trucks Acadia even when the printed size looks correct. Aftermarket wheels, suspension changes, ride-height adjustments, or body alterations can affect clearance at the fender, suspension, or steering components, especially on a model that already uses several different wheel diameters across its trims.
That is why replacement tires should be matched to the actual vehicle setup, not just the original trim chart. An Acadia that has been changed from its factory wheel package may need its current rim diameter and wheel width checked before a tire is selected. Looking at the sidewall, wheel, and clearance together is the safest practical approach.
What should I inspect before driving a 2020 GMC Trucks Acadia on new tires?
Before driving a 2020 GMC Trucks Acadia on new tires, inspect the wheel diameter, confirm the installed tire size matches the sub-model setup, and look over the wheels for visible damage or irregular bead-seat condition. It is also smart to verify inflation, check lug torque, and make sure there is no interference at full steering lock.
A short test drive should be followed by another quick inspection for rubbing, unusual vibration, or air loss. On a trim-specific vehicle like the Acadia, this matters because a correct-looking tire from another sub-model may still be the wrong fitment family. That extra check helps catch wheel-package mistakes before they turn into road-use problems.
How often should tires on a 2020 GMC Trucks Acadia be inspected?
Tires on a 2020 GMC Trucks Acadia should be inspected regularly, not just when they look low or worn. A routine check should include tread condition, uneven wear, cuts, bulges, cracking, and pressure loss. Because this SUV may be used for daily driving, family travel, or mixed road conditions, small issues can become more noticeable quickly.
Monthly visual checks are a practical habit, with closer inspection before longer trips or seasonal driving changes. It also helps to recheck tires anytime the Acadia has had wheel service, suspension work, or a curb impact. Keeping an eye on wear patterns can reveal alignment or setup issues early, especially when the vehicle runs wider 17-inch or lower-profile 20-inch configurations.
