The 2019 GMC Trucks Sierra 1500 sits in the modern full-size pickup market with a broad spread of trims, wheel packages, and road-use personalities, from work-oriented configurations to upscale Denali and off-road-leaning AT4 models. That wide trim range matters at the tire level, because this Sierra 1500 uses six different primary radial sizes across 17-, 18-, 20-, and 22-inch rims. Some versions keep a more practical truck-sidewall profile, while others move toward larger-diameter wheel packages with a lower-profile look. The key step is matching the exact sub-model and wheel setup first, then choosing a tire that suits how the truck is actually driven and presented.
Which Tire Size Is Right for The 2019 GMC Trucks Sierra 1500
The 2019 GMC Trucks Sierra 1500 uses six primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. All of these fitments are radial, but they span 17-, 18-, 20-, and 22-inch rims, so the first step is confirming both the trim and the wheel currently on the truck before comparing tire choices.
265/65R18 is a metric radial size in which 265 identifies the nominal section width in millimeters, 65 is the aspect ratio, R indicates radial construction, and 18 is the rim diameter in inches. On the 2019 GMC Trucks Sierra 1500, this size is part of the 18-inch fitment group and suits trucks equipped with that wheel diameter. It keeps a modern truck fitment profile rather than a vintage sizing convention. This is the size to evaluate when the truck is already riding on 18-inch wheels and the sub-model calls for that setup.
275/60R20 is a metric radial size with a 275-millimeter nominal section width, a 60-series aspect ratio, radial construction, and a 20-inch rim diameter. For the 2019 GMC Trucks Sierra 1500, this size appears across multiple sub-models, making it one of the more widely used 20-inch fitments in the lineup. Its sizing reflects a factory-style modern truck and SUV format with a substantial wheel diameter. It is the right place to focus when the truck has 20-inch wheels and the trim package was built around that combination.
275/65R18 is a metric radial size that uses a 275-millimeter nominal section width, a 65-series aspect ratio, and an 18-inch rim diameter. On the 2019 GMC Trucks Sierra 1500, this size is tied to an 18-inch setup with a taller overall profile than some of the lower-profile wheel packages used elsewhere in the range. BFGoodrich offers this size in the All-Terrain T/A KO2 series with a raised white letter sidewall. It is the size to consider when an AT4 is equipped with this specific 18-inch package and a more all-terrain-oriented tire style is desired.
255/70R17 is a metric radial size where 255 is the nominal section width in millimeters, 70 is the aspect ratio, R denotes radial construction, and 17 is the wheel diameter in inches. Within the 2019 GMC Trucks Sierra 1500 range, this size belongs to 17-inch wheel applications and represents one of the more traditional truck-profile fitments in the lineup. Its sizing points to a taller sidewall than the 20- and 22-inch combinations. This is the fitment to verify when a Base or SLE truck retains its 17-inch wheel setup.
265/70R17 is a metric radial size with a 265-millimeter nominal section width, a 70-series profile, and a 17-inch rim diameter. On the 2019 GMC Trucks Sierra 1500, it is another 17-inch fitment, but it differs from 255/70R17 enough that the exact wheel and sub-model still need to be confirmed before selecting a tire. BFGoodrich offers this size in the All-Terrain T/A KO2 series with a raised white letter sidewall, including versions with different load capacities. It is the right size to review when the truck uses a 17-inch package and a more aggressive all-terrain style is part of the goal.
275/50R22 is a metric radial size that combines a 275-millimeter nominal section width with a 50-series aspect ratio on a 22-inch rim. For the 2019 GMC Trucks Sierra 1500, this fitment belongs to trucks equipped with the largest wheel package shown here, and it creates a distinctly different tire-and-wheel presentation from the 17- and 18-inch setups. Its role is closely tied to appearance and wheel package selection rather than general interchange across the range. It should be chosen only after confirming that the truck is actually equipped for the 22-inch fitment.
Tire fitment varies noticeably across 2019 GMC Trucks Sierra 1500 sub-models, and several trims use more than one primary size depending on wheel package. Checking the exact sub-model matters, but confirming the truck’s current wheel diameter is just as important before choosing a replacement tire.
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2019 GMC Trucks Sierra 1500 AT4
The 2019 GMC Trucks Sierra 1500 AT4 uses three radial tire sizes, all tied to either 18-inch or 20-inch wheel setups. Tire selection starts with confirming which wheel package is on the truck, then narrowing the choice to the right size and intended use.
The 2019 GMC Trucks Sierra 1500 Base uses radial fitments on 17-inch wheels, with two primary size possibilities. That makes wheel and existing tire confirmation especially important before replacement, even within a straightforward work-oriented trim level.
The 2019 GMC Trucks Sierra 1500 Denali uses radial tires in either a 20-inch or 22-inch wheel fitment. That difference has a major effect on replacement selection, so identifying the actual wheel diameter comes before comparing tire style or profile.
The 2019 GMC Trucks Sierra 1500 Elevation uses radial tire fitments on 20-inch or 22-inch wheels. Because both sizes belong to larger wheel packages, the first step is confirming which setup the truck carries now rather than assuming all Elevation models use the same tire.
The 2019 GMC Trucks Sierra 1500 SLE has the widest spread of tire fitments here, covering 17-, 18-, 20-, and 22-inch radial combinations. Replacement choice depends on matching the actual wheel package on the truck, since trim name alone is not enough to identify the tire size.
The 2019 GMC Trucks Sierra 1500 SLT uses three radial tire sizes across 18-, 20-, and 22-inch wheel options. Tire selection is therefore less about construction choice and more about confirming the exact wheel package before comparing the available replacement sizes.
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 Sierra 1500 Tires for Sale
Available product coverage centers on 275/65R18 and 265/70R17, with BFGoodrich All-Terrain T/A KO2 options in radial construction and raised white letter sidewalls. Within 265/70R17, the main comparison points include load-capacity differences and rim-width compatibility within the same tire series.
For the 2019 GMC Trucks Sierra 1500, the biggest questions usually involve identifying the correct size by sub-model and wheel diameter, then comparing radial tire choices, sidewall style, and practical fitment checks before road use.
Tire Size & Fitment
What tire size fits a 2019 GMC Trucks Sierra 1500?
The 2019 GMC Trucks Sierra 1500 uses six primary tire sizes: 255/70R17, 265/70R17, 265/65R18, 275/65R18, 275/60R20, and 275/50R22. All are radial fitments, but they do not apply across every Sierra 1500 in the same way because different sub-models and wheel packages use different sizes.
The practical question is not just which size belongs to the Sierra 1500 generally, but which size matches the exact truck in front of you. Checking the current sidewall marking, sub-model, and wheel diameter is the safest starting point, especially on trims such as SLE, AT4, Denali, and SLT where more than one fitment appears.
What size rim does a 2019 GMC Trucks Sierra 1500 use?
A 2019 GMC Trucks Sierra 1500 can use 17-inch, 18-inch, 20-inch, or 22-inch rims depending on sub-model and wheel package. The tire sizes in this range are built around those rim diameters, so the wheel size is one of the most important fitment details to verify before replacing tires.
A mismatch between tire size and rim diameter is an immediate problem, so the wheel should always be confirmed before anything else. Looking at the existing tire size, checking the wheel itself, and confirming whether the truck still has its original-style setup helps avoid ordering a 17-inch tire for an 18-inch truck or a 20-inch tire for a 22-inch wheel.
Why does the 2019 GMC Trucks Sierra 1500 have more than one tire size?
The 2019 GMC Trucks Sierra 1500 has more than one tire size because the model range includes several sub-models and multiple wheel packages. AT4, Base, Denali, Elevation, SLE, and SLT do not all share the same combination, and some trims use more than one primary size depending on how the truck was equipped.
That means replacement tires should be chosen from the truck’s actual configuration rather than from the model name alone. Wheel diameter is the fastest way to narrow it down, and the current sidewall size marking provides another useful check, especially if the truck has changed hands or has been updated with a different wheel package over time.
Choosing the Right Tire
What should I consider when choosing a 2019 GMC Trucks Sierra 1500 tire?
Start with the exact tire size and wheel diameter used on the truck, because the 2019 GMC Trucks Sierra 1500 spans six different radial fitments. After that, the decision shifts to how the truck is used, whether the goal is a standard road-going replacement, a larger-wheel appearance, or a more all-terrain-oriented setup within the correct size.
It also helps to compare practical product details such as rim-width range, load capacity, sidewall style, and tire series where those choices exist. A truck that still has its original-style wheel setup may call for a straightforward same-size replacement, while a truck with changed wheels or suspension should have its current configuration checked before final selection.
What sidewall styles are available for 2019 GMC Trucks Sierra 1500 tires?
Among the available products here, the visible sidewall style is RWL, or raised white letter. That treatment appears on BFGoodrich All-Terrain T/A KO2 options in 275/65R18 and 265/70R17, giving those Sierra 1500 fitments a more traditional off-road and truck-performance presentation than a plain black sidewall would.
Sidewall style is mostly an appearance decision once the correct size, rim diameter, and load needs are covered. Raised white letters can change the truck’s visual character noticeably, so they tend to matter most to owners who want an all-terrain look rather than a purely understated replacement within the same size and wheel package.
What brands offer tires for the 2019 GMC Trucks Sierra 1500?
BFGoodrich is represented in the currently available product coverage for the 2019 GMC Trucks Sierra 1500. The brand appears in the All-Terrain T/A KO2 series for 275/65R18 and 265/70R17, both in radial construction and with raised white letter sidewalls suited to a more rugged truck appearance.
Brand alone should not drive the decision ahead of fitment. The more important step is confirming that the truck uses one of those sizes, then comparing the product details that matter within that size, such as load specification, rim-width range, and whether the truck’s use leans more toward daily road service, mixed use, or a more all-terrain presentation.
Restoration & Appearance
Which tire should I choose for a period-style 2019 GMC Trucks Sierra 1500?
A period-style choice for a 2019 GMC Trucks Sierra 1500 usually means staying with the tire size and wheel diameter that suit the truck’s original-era trim and stance. Because this Sierra range uses six different radial sizes across 17- through 22-inch wheels, the right starting point is matching the exact sub-model and wheel package first.
Appearance then becomes a matter of profile and sidewall treatment within the correct size. A 17-inch or 18-inch setup can keep a more traditional truck look, while 20-inch and 22-inch packages carry a more contemporary factory-era presentation. Owners pursuing exact showroom-era accuracy should also compare against window-sticker, dealer, or marque-specific reference material.
How does tire construction affect the appearance of a restored 2019 GMC Trucks Sierra 1500?
On a 2019 GMC Trucks Sierra 1500, tire construction does not create a bias-ply-versus-radial appearance decision because the primary fitments here are all radial. The visual differences come more from the actual size, sidewall height, wheel diameter, and any sidewall treatment, especially when comparing 17-inch and 18-inch setups with 20-inch or 22-inch packages.
That makes the appearance question more about proportion than construction type. A taller-sidewall truck tire can look more utility-focused, while a lower-profile tire on a larger wheel gives the Sierra a more upscale or street-oriented presentation. Keeping the truck’s intended trim character in mind usually leads to a better visual result than changing size for style alone.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 GMC Trucks Sierra 1500?
Yes, modifications can affect tire fitment on a 2019 GMC Trucks Sierra 1500, especially when wheel diameter, wheel width, offset, ride height, or suspension parts have been changed. Because this truck already spans 17-, 18-, 20-, and 22-inch fitments from the factory, aftermarket changes can make it harder to assume the current tire size matches original trim-based specifications.
The most useful check is the truck’s actual setup as it sits today. Wheel size, sidewall marking, steering clearance, and visible room at the fender and suspension should all be reviewed before choosing a replacement tire, particularly if the Sierra has been lifted, lowered, leveled, or fitted with non-original wheels.
What should I inspect before driving a 2019 GMC Trucks Sierra 1500 on new tires?
Before driving a 2019 GMC Trucks Sierra 1500 on new tires, inspect the wheel diameter and confirm that the tire size matches the truck’s actual setup. It is also smart to check inflation pressure, lug torque, tread seating, and basic clearance at the fenders, suspension, and steering components once the tires are mounted.
A short, careful initial drive helps reveal vibration, rubbing, or pulling before the truck is used normally. Rechecking pressure after the first heat cycle and looking over the sidewalls for any contact marks can catch setup issues early, which is especially important on trims that use larger wheel packages or on trucks that may have had wheel changes.
How often should tires on a 2019 GMC Trucks Sierra 1500 be inspected?
Tires on a 2019 GMC Trucks Sierra 1500 should be inspected regularly rather than only at replacement time. A quick visual check for cuts, punctures, cracking, uneven wear, and low inflation is worthwhile before longer trips, and a closer inspection during routine service helps catch problems that are easy to miss on a busy daily-driven truck.
Inspection matters even more when the Sierra sees towing, rough roads, or long periods between uses. Watching for shoulder wear, center wear, and slow air loss can reveal alignment or pressure issues early, and trucks with larger wheels or all-terrain tires benefit from occasional clearance and suspension checks to make sure nothing is contacting under load or steering travel.
