The 2019 GMC Trucks Terrain sits in the compact crossover segment with a balance of everyday road manners, available upscale trim levels, and the kind of versatility buyers expect from a modern GMC utility vehicle. On this exact model, tire selection starts with identifying the correct trim because the Terrain uses three different primary radial sizes: 225/65R17, 225/60R18, and 235/50R19. That makes wheel diameter just as important as the tire size itself. Once the right fitment is confirmed, the decision shifts to matching the Terrain’s intended use, overall appearance, and current wheel setup, especially on SLE and SLT models that can appear with more than one size.
Which Tire Size Is Right for The 2019 GMC Trucks Terrain
The 2019 GMC Trucks Terrain uses three primary tire sizes, and they vary by sub-model and wheel diameter. Before choosing a tire, confirm the exact trim and verify whether the vehicle is on a 17-inch, 18-inch, or 19-inch wheel, since that determines whether 225/65R17, 225/60R18, or 235/50R19 is the correct fitment.
235/50R19 is a metric radial size in which 235 refers to nominal section width in millimeters, 50 is the aspect ratio, R identifies radial construction, and 19 is the wheel diameter in inches. On the 2019 GMC Trucks Terrain, this size is part of the larger-wheel fitment used on certain sub-models rather than the full range. Its lower-profile metric format gives it a different sizing character than the 17-inch and 18-inch options. This is the right size to evaluate only after confirming that the Terrain is actually equipped with a 19-inch wheel.
225/65R17 is a metric radial size where 225 is the nominal section width in millimeters, 65 is the aspect ratio, R denotes radial construction, and 17 is the rim diameter in inches. For the 2019 GMC Trucks Terrain, this size appears on specific trim levels and uses the smallest wheel diameter of the three primary fitments. Available product coverage in this size includes a BFGoodrich All-Terrain T/A KO2 with an RBL sidewall treatment. This size deserves a closer look when the Terrain is driven in conditions where a more truck-oriented tread design is part of the buying decision.
225/60R18 is a metric radial size that combines a 225-millimeter nominal section width with a 60-series profile on an 18-inch wheel. Within the 2019 GMC Trucks Terrain range, it serves as a middle ground between the 17-inch and 19-inch primary fitments and is used on selected sub-models rather than every configuration. Its metric radial format is familiar to modern buyers, but the practical issue is still exact trim and wheel confirmation. This is the size to pursue when the Terrain is already set up with 18-inch wheels and the goal is to stay within the proper original fitment family.
Tire fitment on the 2019 GMC Trucks Terrain is not the same across every sub-model, and some trims can appear with more than one primary size. Checking the exact sub-model matters first, then the installed wheel diameter, because 17-inch, 18-inch, and 19-inch fitments are all used within the Terrain lineup.
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2019 GMC Trucks Terrain Denali
The 2019 GMC Trucks Terrain Denali uses the 235/50R19 radial size. Tire selection starts with confirming the 19-inch wheel, then choosing a tire that matches how the vehicle is used and whether the goal is to preserve its existing wheel-and-tire presentation.
The 2019 GMC Trucks Terrain SL uses the 225/65R17 radial size. That makes the decision more straightforward, with the focus shifting from size identification to wheel compatibility, tread style, and how the vehicle is expected to be driven.
The 2019 GMC Trucks Terrain SLE can use 225/65R17, 225/60R18, or 235/50R19, so this trim requires the most careful confirmation before a tire is selected. The key step is checking the actual wheel diameter on the vehicle rather than relying on trim name alone.
The 2019 GMC Trucks Terrain SLE Diesel uses the 225/65R17 radial size. With the fitment narrowed to one primary size, the main considerations become tire type, wheel-width compatibility, and whether the Terrain is kept strictly on-road or sees rougher mixed-use driving.
The 2019 GMC Trucks Terrain SLT uses either 225/60R18 or 235/50R19 depending on the wheel setup. That means the buyer should verify whether the vehicle is on 18-inch or 19-inch wheels before comparing tire choices or assuming one SLT fitment applies to all.
The 2019 GMC Trucks Terrain SLT Diesel uses the 225/60R18 radial size. Once the 18-inch wheel fitment is confirmed, the decision becomes a standard modern replacement question centered on maintaining the proper size and matching the tire to the vehicle’s use.
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 2019 GMC Trucks Terrain Tires for Sale
Available product coverage for the 2019 GMC Trucks Terrain currently centers on 225/65R17, including a BFGoodrich All-Terrain T/A KO2 radial with an RBL sidewall. That makes the product grid most useful for buyers comparing a more aggressive tread style within the correct 17-inch fitment.
The most common 2019 GMC Trucks Terrain tire questions center on identifying the correct size by trim, confirming wheel diameter, and choosing a tire that suits the vehicle’s actual use. The answers below focus on fitment, product selection, and practical road-use checks.
Tire Size & Fitment
What tire size fits a 2019 GMC Trucks Terrain?
The 2019 GMC Trucks Terrain uses three primary tire sizes: 225/65R17, 225/60R18, and 235/50R19. All are radial sizes, but they do not apply across the lineup in the same way because fitment changes by sub-model and wheel diameter.
The first step is matching the tire size to the exact Terrain trim and the wheels currently on the vehicle. SLE and SLT models can appear with more than one primary size, so checking the sidewall of the existing tire and confirming the wheel diameter is the safest way to narrow the fitment before comparing replacement choices.
What size rim does a 2019 GMC Trucks Terrain use?
A 2019 GMC Trucks Terrain can use 17-inch, 18-inch, or 19-inch rims depending on sub-model and tire fitment. Those wheel diameters correspond to 225/65R17, 225/60R18, and 235/50R19 respectively, so the final number in each tire size points directly to the required rim diameter.
Rim diameter should be confirmed before anything else because a 17-inch tire cannot be mounted on an 18-inch or 19-inch wheel, and the reverse is equally true. On trims with more than one possible fitment, checking the wheel itself or the current tire sidewall helps prevent ordering the right width and profile in the wrong diameter.
Why does the 2019 GMC Trucks Terrain have more than one tire size?
The 2019 GMC Trucks Terrain has more than one tire size because different sub-models use different wheel packages. Denali uses 235/50R19, SL and SLE Diesel use 225/65R17, SLT Diesel uses 225/60R18, and SLE and SLT can be equipped with more than one primary size.
That means trim name alone does not always settle the question, especially on SLE and SLT models. The practical approach is to identify the sub-model, then verify the actual wheel diameter on the vehicle, since replacement decisions depend on the exact setup rather than on the Terrain nameplate by itself.
Choosing the Right Tire
What should I consider when choosing a 225/65R17 tire for a 2019 GMC Trucks Terrain?
Start with the basics: the correct size, radial construction, and compatibility with the wheel already on the vehicle. In 225/65R17, one available option is the BFGoodrich All-Terrain T/A KO2, an RBL-sidewall radial with a more truck-oriented character than a typical highway-focused crossover tire.
Selection should reflect how the Terrain is actually used. A buyer comparing this type of tire should look at tread intent, rim-width compatibility, load capacity, and whether the vehicle stays mostly on pavement or sees rougher surfaces. Matching the tire to the vehicle’s day-to-day role matters more than choosing by brand name alone.
What sidewall styles are available for 2019 GMC Trucks Terrain tires?
Among the currently covered product options for the 2019 GMC Trucks Terrain, the visible sidewall style is RBL in the 225/65R17 fitment. That gives the buyer a distinct sidewall presentation in addition to the tire’s tread design and general construction type.
Sidewall style is mostly an appearance choice unless it comes with a different tire family or intended use. The main thing to remember is that sidewall treatment should come after confirming the correct size and wheel diameter, especially on a Terrain lineup where several trims use different primary fitments.
What brands offer tires for the 2019 GMC Trucks Terrain?
Current product coverage for the 2019 GMC Trucks Terrain includes BFGoodrich in the 225/65R17 size. That option appears in the All-Terrain T/A KO2 series and gives buyers in that fitment a clearly defined replacement path within a recognized truck and SUV tire line.
Brand is only one part of the decision. A better comparison starts with the exact Terrain trim, the mounted wheel diameter, and the intended use of the vehicle, then works outward to tread style, rim-width compatibility, and sidewall appearance so the replacement makes sense for the actual setup.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 GMC Trucks Terrain?
Yes, modifications can affect tire fitment on a 2019 GMC Trucks Terrain even when the replacement tire matches one of the original size families. Aftermarket wheels, changes in wheel width, altered offset, suspension lowering, or body modifications can all change clearance and the way a tire sits in the wheel opening.
A modified Terrain should be checked for more than just nominal tire size. Wheel diameter, steering clearance, suspension travel, and space at the fender edge all deserve attention before mounting replacements, especially on trims that already span 17-inch, 18-inch, and 19-inch fitments from the factory.
What should I inspect before driving a 2019 GMC Trucks Terrain on new tires?
Before driving on new tires, inspect the wheels for damage, confirm the tire size matches the vehicle’s actual wheel diameter, and make sure inflation is correct for the application. It also helps to check for any uneven wear patterns that could point to alignment or suspension issues carried over from the previous set.
A short inspection drive should include listening for rubbing, watching for vibration, and confirming that the tires clear through full steering lock. On a Terrain with multiple possible factory sizes, this matters even more because using the correct size family is only part of the job; the vehicle’s present wheel and suspension condition also matter.
What should I check before a longer drive in a 2019 GMC Trucks Terrain?
Before a longer drive, check inflation pressure, tread condition, visible sidewall condition, and any signs of cuts, bulges, or slow air loss. The wheel setup should also be verified so the Terrain is running the correct tire size for its actual 17-inch, 18-inch, or 19-inch rim.
Longer trips put more emphasis on consistency and condition than short local use does. A Terrain that has sat for extended periods should get an extra look for age-related cracking and flat-spotting, while any vehicle with replacement wheels should be checked for proper clearance and secure fit before highway driving.
