The 2014 GMC Trucks Acadia sits in the full-size crossover era when three-row utility vehicles were expected to carry family, cargo, and highway miles with equal ease. In Denali, SLE, and SLT form, it balanced a substantial footprint with a more polished road-going character than a traditional truck-based SUV. Tire choice on the 2014 GMC Trucks Acadia centers on three radial sizes: 255/65R18, 255/60R19, and 255/55R20, with fitment varying by sub-model and wheel package. Because these sizes share a similar overall diameter but use different rim diameters, the key step is confirming the exact sub-model and wheel setup before choosing a replacement tire.
Which Tire Size Is Right for The 2014 GMC Trucks Acadia
Three tire sizes apply to the 2014 GMC Trucks Acadia, and the right one depends on the sub-model and wheel diameter on the vehicle. All three are radial metric sizes with closely related overall proportions, but they mount on different 18-inch, 19-inch, or 20-inch rims. Before selecting a replacement, confirm whether the Acadia is an SLE, SLT, or Denali and verify the actual wheel diameter currently installed.
255/55R20 is a metric radial size in which 255 indicates nominal section width in millimeters, 55 is the aspect ratio, R identifies radial construction, and 20 is the rim diameter in inches. On the 2014 GMC Trucks Acadia, this size is tied to 20-inch wheel applications and appears across multiple sub-models. It suits owners replacing an existing 20-inch setup and keeps the search focused on tires built for that wheel diameter. Wheel confirmation matters first, especially on vehicles that may have been changed from their original package.
255/65R18 is a metric radial size with a 255-millimeter nominal section width, a 65-series profile, radial construction, and an 18-inch rim fitment. On the 2014 GMC Trucks Acadia, this size is associated with certain SLE applications using the 18-inch wheel package. Its practical role is straightforward: it is the correct starting point for an Acadia already equipped with 18-inch wheels rather than a substitute for the 19-inch or 20-inch setups. Checking the wheel itself is more reliable than choosing by appearance alone, since these sizes are similar in overall diameter.
255/60R19 follows the same metric radial format, pairing a 255-millimeter nominal section width with a 60-series profile on a 19-inch rim. For the 2014 GMC Trucks Acadia, this size is used on certain SLT applications equipped with 19-inch wheels. It gives buyers a clear fitment path when the vehicle retains that factory-style wheel diameter, while still requiring a check of the actual wheel currently on the Acadia. That step is especially important on used vehicles, where wheel swaps can make the sub-model badge only part of the fitment picture.
Sub-model fitment matters on the 2014 GMC Trucks Acadia because tire size changes with the wheel package. Denali uses one size, while SLE and SLT can each appear with more than one radial fitment, so confirming the exact sub-model and wheel diameter is the safest starting point.
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2014 GMC Trucks Acadia Denali
The 2014 GMC Trucks Acadia Denali uses a single radial tire size tied to its 20-inch wheel setup. That makes replacement more straightforward, but the wheel should still be checked on the vehicle before ordering, especially if it has seen aftermarket changes.
The 2014 GMC Trucks Acadia SLE can use either an 18-inch or 20-inch radial tire fitment depending on the wheel package. Tire selection starts with confirming which wheels are actually on the vehicle, since the two sizes are not interchangeable by rim diameter.
The 2014 GMC Trucks Acadia SLT can be equipped with either a 19-inch or 20-inch radial tire setup. Choosing correctly means matching the replacement tire to the wheel on the vehicle rather than relying on trim name alone.
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 2014 GMC Trucks Acadia tire size selection, sub-model and rim-diameter differences, and the practical checks that matter before replacing tires on an SLE, SLT, or Denali.
Tire Size & Fitment
What tire size fits a 2014 GMC Trucks Acadia?
A 2014 GMC Trucks Acadia uses one of three radial tire sizes: 255/65R18, 255/60R19, or 255/55R20. The exact size depends on the sub-model and wheel package, with Denali using 255/55R20, SLE using either 255/65R18 or 255/55R20, and SLT using either 255/60R19 or 255/55R20.
The most important step is matching the tire to the wheel diameter currently on the vehicle. An 18-inch tire only works on an 18-inch wheel, a 19-inch tire only works on a 19-inch wheel, and a 20-inch tire only works on a 20-inch wheel, so checking the sidewall and the wheel itself helps avoid ordering the wrong size.
What size rim does a 2014 GMC Trucks Acadia use?
The 2014 GMC Trucks Acadia uses 18-inch, 19-inch, or 20-inch rims depending on the tire size and sub-model configuration. The matching size pairs are 255/65R18 on an 18-inch rim, 255/60R19 on a 19-inch rim, and 255/55R20 on a 20-inch rim.
Rim diameter is the first fitment check because tire size cannot be separated from wheel size. Even though these Acadia tire sizes have very similar overall diameters, the bead seat must match the wheel exactly, so a quick confirmation of the existing wheel package is more useful than comparing the tires by looks alone.
Why does the 2014 GMC Trucks Acadia have more than one tire size?
The 2014 GMC Trucks Acadia has more than one tire size because different sub-models and wheel packages were used across the lineup. SLE and SLT can each appear with two different sizes, while Denali uses a single 20-inch fitment. All three sizes are radial, but each is built around a different rim diameter.
That means the right replacement is determined by the exact wheel setup, not just by the model name on the liftgate. On a used Acadia, checking the current wheel diameter is especially important because wheel changes can leave the vehicle wearing a size that does not match what the trim originally used.
Choosing the Right Tire
What should I consider when choosing a 2014 GMC Trucks Acadia tire?
Start with the correct size for the vehicle's actual wheel package: 255/65R18, 255/60R19, or 255/55R20. On a 2014 GMC Trucks Acadia, that choice is tied to sub-model and rim diameter first, so the basic decision is not which profile looks close, but which size matches the wheel already on the vehicle.
After size is confirmed, compare the tire's intended use against how the Acadia is driven. Daily road use, family hauling, seasonal mileage, and any prior wheel changes all matter, and it is smart to inspect the current tire sidewall and wheel markings before replacement so the new set matches the vehicle's real-world setup.
How do I choose between the available 2014 GMC Trucks Acadia tire sizes?
The available sizes are not alternatives to pick from freely; each one belongs to a specific wheel diameter. A 2014 GMC Trucks Acadia with 18-inch wheels needs 255/65R18, a 19-inch setup needs 255/60R19, and a 20-inch setup needs 255/55R20.
Choosing correctly comes down to confirming the wheel that is actually on the vehicle today. That is especially helpful with SLE and SLT models, since each can appear with more than one fitment, and an Acadia that has had replacement wheels installed may not still match its original trim-based tire package.
What rim-fitment details should I compare when choosing tires for a 2014 GMC Trucks Acadia?
Rim diameter is the critical detail to compare on a 2014 GMC Trucks Acadia because the vehicle uses three different tire sizes built for three different wheel diameters. The tire and wheel must match exactly at 18, 19, or 20 inches, even though the overall tire dimensions are quite close across the three sizes.
Wheel condition and any non-original wheel changes also deserve attention before replacement. Looking at the wheel stamping, confirming the size already mounted, and making sure there is no mismatch between the existing tire and wheel helps prevent fitment problems and keeps the next set aligned with the Acadia's actual configuration.
Restoration & Appearance
Does correct tire fitment matter for a 2014 GMC Trucks Acadia restoration or preservation project?
Yes, correct tire fitment still matters on a 2014 GMC Trucks Acadia being preserved in original-style condition. The main issue is matching the proper size to the correct wheel package, since this model used 18-inch, 19-inch, and 20-inch applications depending on sub-model and trim configuration.
For an owner keeping the vehicle close to its original presentation, confirming the existing wheels against the sub-model is a sensible first step. A preserved Acadia usually looks more coherent when tire size, wheel diameter, and ride stance remain consistent with the package the vehicle was built around.
How does tire size affect the appearance of a 2014 GMC Trucks Acadia?
Tire size affects the visual balance of a 2014 GMC Trucks Acadia because each size is tied to a different wheel diameter and sidewall proportion. The 18-inch, 19-inch, and 20-inch fitments all maintain a similar overall tire height, but they present a different wheel-to-sidewall relationship on the vehicle.
That difference matters when keeping an Acadia close to its intended look. A replacement that matches the wheel package already on the vehicle helps preserve the stance and visual character of the trim, while an incorrect size can create an obvious mismatch between the wheel, tire sidewall, and body proportions.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2014 GMC Trucks Acadia?
Yes, modifications can affect tire fitment on a 2014 GMC Trucks Acadia. Aftermarket wheels, suspension changes, lowering, or body alterations can change the wheel diameter, tire clearance, or both, which matters on a vehicle that already came with multiple factory tire sizes across different sub-models.
A modified Acadia should be checked at the wheel and tire currently installed rather than assumed to follow trim-based fitment. Looking at wheel diameter, steering clearance, and the space around the fender and suspension helps confirm that the replacement size matches the vehicle as it sits today.
What should I inspect before driving a 2014 GMC Trucks Acadia on new tires?
Before driving a 2014 GMC Trucks Acadia on new tires, inspect the wheel size, tire pressure, and the general condition of the wheels and suspension. It is also smart to confirm that all four tires match the intended size for the vehicle's wheel package and that there is no visible rubbing or clearance issue at full steering lock.
A short test drive should include attention to vibration, pull, and any contact noise from the wheel wells. Rechecking pressure after installation and making sure lug hardware, alignment condition, and wheel seating are all in order can help the new tires settle in properly for regular road use.
How often should tires on a 2014 GMC Trucks Acadia be inspected?
Tires on a 2014 GMC Trucks Acadia should be inspected regularly, with extra attention before longer drives, seasonal changes, or after any wheel or suspension work. A routine look for uneven wear, cracking, cuts, bulges, and slow air loss is especially worthwhile on a crossover that may alternate between daily use and periods of lighter use.
Keeping inspections consistent helps catch both tire-condition problems and fitment issues early. On an Acadia with non-original wheels or recent replacements, periodic checks also confirm that the tires are wearing evenly and maintaining proper clearance, which is just as important as choosing the correct size in the first place.
