The 2019 Buick Regal Sportback blends Buick comfort with a sleeker hatchback shape than many buyers expect from the badge, giving it a more European-flavored road-car character. That makes tire choice especially important, because the Regal Sportback spans several wheel and tire packages across its trim lineup. Depending on sub-model, it uses 225/55R17, 245/45R18, or 245/40R19 radial tires. Available choices range from blackwall performance-oriented series to Silvertown Radial whitewall and redline treatments in 225/55R17. The right decision starts with confirming the exact trim and wheel diameter, then choosing the tire style and driving character that best suits the car.
Which Tire Size Is Right for The 2019 Buick Regal Sportback
The 2019 Buick Regal Sportback uses three primary tire sizes, and the correct one depends on the exact sub-model and wheel package. All three are radial tires, but they mount on different rim diameters: 17, 18, or 19 inches. Before comparing brands or tire styles, the first step is confirming both the trim level and the actual wheel diameter currently on the car.
A 245/40R19 tire is a metric radial size with a 245-millimeter section width, a 40-series aspect ratio, and fitment for a 19-inch rim. On the 2019 Buick Regal Sportback, this size suits trims that use the larger 19-inch wheel package and keeps the low-profile look that goes with that setup. Available choices center on BFGoodrich blackwall radial lines, including g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A. This size makes the most sense when the car already has the correct 19-inch wheels and the goal is to keep its existing wheel-and-tire proportion.
A 225/55R17 tire is a metric radial size that combines a 225-millimeter section width with a 55-series profile for a 17-inch rim. On the 2019 Buick Regal Sportback, this size appears on trims that use the smaller 17-inch wheel package and offers the broadest visual variety among the available tire choices. Options include blackwall BFGoodrich g-Force lines as well as Silvertown Radial versions with wide whitewall and redline sidewall treatments. It is the size to evaluate when the car has 17-inch wheels and the buyer wants either a straightforward modern look or a more custom appearance.
A 245/45R18 tire is a metric radial size with a 245-millimeter section width, a 45-series profile, and fitment for an 18-inch rim. For the 2019 Buick Regal Sportback, this size serves trims positioned between the 17-inch and 19-inch wheel packages, so it is important not to confuse it with the similar-width 19-inch fitment. Product choices include BFGoodrich g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and the Nitto NT555 G2, all in blackwall form. This size is worth choosing only after confirming the car actually carries the 18-inch wheel setup.
Tire fitment varies across the 2019 Buick Regal Sportback lineup, so trim identification matters before choosing a replacement. Some sub-models share a size, while others use a different wheel diameter entirely, making wheel confirmation just as important as trim confirmation.
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2019 Buick Regal Sportback Avenir
The 2019 Buick Regal Sportback Avenir uses the 245/40R19 radial size, which places it on the 19-inch wheel package. Tire selection here centers on staying with the correct low-profile fitment and comparing the available blackwall performance-oriented radial choices within that size.
The 2019 Buick Regal Sportback Base uses the 225/55R17 radial size on a 17-inch rim. That gives the owner a choice between conventional blackwall replacements and more appearance-focused Silvertown Radial options such as wide whitewall or redline styling.
The 2019 Buick Regal Sportback Essence uses the 245/45R18 radial size. Choosing tires for this trim means confirming the 18-inch wheel setup first, then comparing blackwall offerings across the available BFGoodrich and Nitto product lines.
The 2019 Buick Regal Sportback GS also uses the 245/40R19 radial size. That keeps tire selection focused on 19-inch blackwall radial options, with the main decision being which tire series best matches the car's intended street use and overall presentation.
The 2019 Buick Regal Sportback Preferred can use either 225/55R17 or 245/45R18, so this trim requires extra attention before ordering tires. The critical step is checking which wheel diameter is actually on the car, since the 17-inch and 18-inch packages use different tire sizes and different product mixes.
The 2019 Buick Regal Sportback Preferred II uses the 245/45R18 radial size. Tire choice is straightforward once the 18-inch wheels are confirmed, and the buyer can then compare the available blackwall radial series by brand, rim-width specification, and overall tire character.
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 Buick Regal Sportback Tires for Sale
Available 2019 Buick Regal Sportback tires are all radial designs, with BFGoodrich covering every primary size and Nitto joining the 245/45R18 fitment. Choices vary by tire series and sidewall treatment, with blackwall options across the lineup and wide whitewall or redline styling available in 225/55R17.
Common 2019 Buick Regal Sportback tire questions usually come down to identifying the right trim, confirming wheel diameter, and choosing among the available radial, sidewall, and product-series options. The answers below also cover appearance choices, modifications, and road-use checks.
Tire Size & Fitment
What tire size fits a 2019 Buick Regal Sportback?
The 2019 Buick Regal Sportback uses three primary tire sizes: 225/55R17, 245/45R18, and 245/40R19. The correct size depends on the exact sub-model and wheel package, not simply the model name on the decklid.
Base models use 225/55R17, Essence and Preferred II use 245/45R18, and Avenir and GS use 245/40R19. Preferred models can use either 225/55R17 or 245/45R18, so the safest next step is checking the trim and physically confirming whether the car has 17-inch, 18-inch, or 19-inch wheels before selecting tires.
What size rim does a 2019 Buick Regal Sportback use?
A 2019 Buick Regal Sportback can use 17-inch, 18-inch, or 19-inch rims, depending on the sub-model. The tire sizes align with those wheel diameters: 225/55R17 fits 17-inch rims, 245/45R18 fits 18-inch rims, and 245/40R19 fits 19-inch rims.
Wheel diameter is the first fitment detail to verify because the three primary tire sizes are tied to different rims. Even when overall tire diameter stays close across the lineup, a 17-inch tire will not mount on an 18-inch or 19-inch wheel, so checking the actual wheel on the car matters more than assuming by appearance.
Do all 2019 Buick Regal Sportback sub-models use the same tire size?
No, the 2019 Buick Regal Sportback does not use one tire size across the full lineup. Different sub-models use different wheel-and-tire combinations, and the Preferred trim can be found with either of two sizes.
That variation means a buyer should identify the exact trim before comparing brands or product series. Avenir and GS use 245/40R19, Base uses 225/55R17, Essence and Preferred II use 245/45R18, and Preferred may use either 225/55R17 or 245/45R18. Verifying the tire placard or the wheel diameter on the car helps prevent ordering the right size for the wrong trim.
Choosing the Right Tire
What should I consider when choosing a 2019 Buick Regal Sportback tire?
Start with the correct tire size for the exact trim and wheel diameter, since the 2019 Buick Regal Sportback uses 17-inch, 18-inch, and 19-inch fitments. After that, the main decision becomes tire character, including radial series, sidewall style, and rim-width compatibility.
A 225/55R17 car leaves room for either blackwall performance-style tires or more appearance-driven Silvertown Radial whitewall and redline options. The 245/45R18 and 245/40R19 sizes stay focused on blackwall performance-oriented choices. It also helps to compare load figures where given, wheel-width range, and whether the car is being kept stock or has aftermarket wheels.
What sidewall styles are available for 2019 Buick Regal Sportback tires?
Sidewall style depends on tire size. Blackwall options are available across all three primary sizes, while 225/55R17 also has wider visual variety with Silvertown Radial choices offered in wide whitewall and redline form.
That means appearance can play a bigger role on Base and some Preferred models using 17-inch wheels. Owners of 18-inch and 19-inch fitments are choosing mainly among blackwall performance-oriented radials, while 17-inch buyers can decide whether they want a more standard modern presentation or a more distinctive custom-style look without changing the vehicle's primary size.
What brands offer tires for the 2019 Buick Regal Sportback?
BFGoodrich offers tires for all three primary 2019 Buick Regal Sportback sizes, including g-Force and Silvertown Radial lines depending on fitment. Nitto appears in the 245/45R18 size with the NT555 G2, giving that 18-inch fitment an additional brand choice.
Brand comparison should still happen inside the correct size for the car. A 17-inch Regal Sportback has the broadest style spread, while 18-inch buyers can compare BFGoodrich and Nitto blackwall options, and 19-inch buyers stay within BFGoodrich g-Force and Phenom offerings. Matching the trim, wheel diameter, and intended look matters more than choosing by brand name alone.
Restoration & Appearance
Which tire should I choose for a period-style 2019 Buick Regal Sportback?
A period-style approach on a 2019 Buick Regal Sportback usually means staying with the correct factory-size relationship for the trim and choosing a tire that suits the car's visual theme. The strongest appearance-driven option appears in 225/55R17, where Silvertown Radial versions are available alongside more standard blackwall choices.
That makes Base and 17-inch Preferred models the easiest place to lean into a custom or nostalgic presentation without changing the primary fitment. For 18-inch and 19-inch applications, the available choices stay blackwall and more contemporary in appearance. Buyers chasing exact as-delivered originality should still compare tire appearance details against Buick literature or marque-specific reference material.
How does tire construction affect the appearance of a restored 2019 Buick Regal Sportback?
On the 2019 Buick Regal Sportback, the primary fitments are radial tires across all listed sizes, so construction choice is less about bias-ply versus radial appearance and more about the tire series and sidewall treatment. Visual differences come mainly from blackwall, redline, or wide whitewall styling where available.
That is especially relevant in 225/55R17, where a Silvertown Radial can change the personality of the car much more than another blackwall radial in the same size. On 18-inch and 19-inch applications, appearance stays more modern and performance-oriented. Keeping the correct size and wheel diameter is still the foundation if the goal is a clean, well-resolved restoration-style presentation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 Buick Regal Sportback?
Yes, modifications can affect tire fitment on a 2019 Buick Regal Sportback even when the tire size matches one of the original trim-level sizes. Changes to wheels, offset, suspension height, or body clearance can alter how a 225/55R17, 245/45R18, or 245/40R19 tire sits on the car.
A Regal Sportback with aftermarket wheels should have its wheel diameter and width checked before replacement tires are ordered. Lowering, spring changes, or alignment changes can also influence fender and steering clearance. The closer the car is kept to its stock wheel-and-suspension setup, the easier it is to stay within the original size strategy for that trim.
What should I inspect before driving a 2019 Buick Regal Sportback on new tires?
Before driving a 2019 Buick Regal Sportback on new tires, inspect the wheels for damage, confirm the tire size matches the trim and rim diameter, and make sure each tire is inflated properly for the vehicle's requirements. It is also worth checking for rubbing at full steering lock and normal suspension travel.
A quick road-readiness check should also include lug torque, valve-stem condition, and general suspension health, especially if the car has been sitting or has had recent wheel changes. Uneven wear on the old tires can point to alignment or suspension issues that new tires will not solve on their own.
How often should tires on a 2019 Buick Regal Sportback be inspected?
Tires on a 2019 Buick Regal Sportback should be inspected regularly for pressure loss, uneven wear, cuts, bulges, and sidewall damage. Even on a newer vehicle platform, routine inspection matters because the car may use low-profile 18-inch or 19-inch tires that can be more sensitive to curb and road-impact damage.
A simple visual check every few weeks and before longer drives is a sensible habit, especially if the car is driven seasonally or stored for stretches. Looking over tread condition, checking air pressure with a reliable gauge, and watching for any vibration or pull on the road can help catch issues before they affect ride quality or fitment.
