The 2020 Buick Regal Sportback sits at the end of Buick’s modern sport-luxury hatchback run, blending midsize comfort with a sleeker fastback profile than a traditional sedan. That makes tire choice more configuration-specific than it first appears, because this Regal Sportback uses three different primary radial sizes depending on trim: 225/55R17, 245/45R18, or 245/40R19. Buyers also have different paths within those sizes, from contemporary blackwall performance-oriented radials to select Silvertown Radial whitewall and redline options in 225/55R17. The right choice starts with confirming the exact sub-model and wheel diameter, then matching the tire’s appearance and driving intent to the car actually in front of you.
Which Tire Size Is Right for The 2020 Buick Regal Sportback
Three primary tire sizes apply to the 2020 Buick Regal Sportback, and they vary by sub-model and wheel diameter rather than by alternate construction. Every primary fitment is a radial, but the first step is still confirming the exact trim and whether the car is on 17-inch, 18-inch, or 19-inch wheels. Once that is settled, the decision shifts to tire series, brand, sidewall style, and the overall character you want from the car.
245/40R19 is a modern metric radial size in which 245 is the nominal section width in millimeters, 40 is the aspect ratio, R indicates radial construction, and 19 is the wheel diameter in inches. On the 2020 Buick Regal Sportback, this size supports trims equipped with a 19-inch wheel and keeps the fitment in a contemporary low-profile format. Available choices center on BFGoodrich g-Force series blackwall tires, including Sport Comp 2, Comp 2 AS, and Phenom T/A. This size makes the most sense when the car already carries the correct 19-inch wheel package and you want to stay with that sharper visual and handling-oriented setup.
225/55R17 is a modern metric radial size with a 225-millimeter nominal section width, a 55-series profile, radial construction, and a 17-inch rim diameter. For the 2020 Buick Regal Sportback, it represents the 17-inch fitment used on certain trims and offers the broadest visual variety among the available choices. Options include BFGoodrich g-Force blackwall tires as well as Silvertown Radial versions with a 1.50 inch whitewall or a redline sidewall. This size is worth close attention if your Regal Sportback is on 17-inch wheels and you want either a straightforward contemporary blackwall look or a more distinctive appearance.
245/45R18 is a modern metric radial size where 245 gives the nominal section width in millimeters, 45 is the aspect ratio, R denotes radial construction, and 18 identifies the wheel diameter in inches. On the 2020 Buick Regal Sportback, this size serves trims using an 18-inch wheel and sits between the 17-inch and 19-inch fitments in wheel diameter while remaining close in overall tire height. Available products include BFGoodrich g-Force blackwall series and the Nitto NT555 G2. This is the size to evaluate when the car is equipped with 18-inch wheels and you want to compare brand and series differences within the correct fitment.
Tire fitment for the 2020 Buick Regal Sportback depends on the exact sub-model, and the covered trims do not all share the same wheel diameter. Confirming the trim name first helps narrow the correct primary size before comparing brands, series, or sidewall treatments.
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2020 Buick Regal Sportback Avenir
The 2020 Buick Regal Sportback Avenir uses the 245/40R19 radial fitment. Tire selection here is mainly about staying with the correct 19-inch size while comparing the available blackwall performance-oriented product lines within that configuration.
The 2020 Buick Regal Sportback Base uses the 225/55R17 radial size. That gives this trim access to both contemporary blackwall choices and select appearance-focused options such as whitewall or redline Silvertown Radial tires on the same 17-inch fitment.
The 2020 Buick Regal Sportback Essence uses the 245/45R18 radial size. Tire selection for this trim centers on matching the 18-inch wheel setup, then choosing between the available blackwall series from BFGoodrich and Nitto.
The 2020 Buick Regal Sportback GS uses the 245/40R19 radial fitment. The main decision is not construction type, but which 19-inch blackwall tire series best matches the car’s existing wheel package and intended road use.
The 2020 Buick Regal Sportback Preferred can use either 225/55R17 or 245/45R18, depending on the wheel setup on the car. Checking the actual wheel diameter is the key first step before narrowing the choice to sidewall style, brand, and tire series.
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 Buick Regal Sportback Tires for Sale
Available Regal Sportback tires vary by size, brand, and series, with BFGoodrich covering all three primary fitments and Nitto appearing in 245/45R18. Most choices are blackwall radials, while 225/55R17 also includes Silvertown Radial options with whitewall and redline sidewall treatments.
Owners of a 2020 Buick Regal Sportback usually need to sort out trim-specific tire size, wheel diameter, and product style before anything else. These FAQs focus on exact fitment, radial tire choices, appearance options, and the checks worth making before road use.
Tire Size & Fitment
What tire size fits a 2020 Buick Regal Sportback?
The 2020 Buick Regal Sportback uses three primary tire sizes: 225/55R17, 245/45R18, and 245/40R19. All three are radial fitments, and the correct size depends on the trim and wheel package rather than a universal single-size setup across the entire model line.
The practical first step is identifying the exact sub-model and confirming the wheel diameter on the car. Base uses 225/55R17, Essence uses 245/45R18, Avenir and GS use 245/40R19, and Preferred can use either 225/55R17 or 245/45R18 depending on the wheel setup.
What size rim does a 2020 Buick Regal Sportback use?
A 2020 Buick Regal Sportback can use 17-inch, 18-inch, or 19-inch rims, depending on the sub-model. The 225/55R17 fitment uses a 17-inch rim, the 245/45R18 fitment uses an 18-inch rim, and the 245/40R19 fitment uses a 19-inch rim.
Wheel diameter matters before any other tire decision because a 17-inch tire does not belong on an 18-inch or 19-inch wheel, and vice versa. The Preferred trim deserves extra attention, since it can be equipped with either a 17-inch or 18-inch setup, so the actual wheel on the car should be checked directly.
Why does the 2020 Buick Regal Sportback have more than one tire size?
The 2020 Buick Regal Sportback has more than one tire size because trim levels use different wheel packages. That is why the model range spans 225/55R17, 245/45R18, and 245/40R19 instead of sharing one single tire size across every version.
Those sizes stay very close in overall diameter, but they are tied to different rim diameters and trim-specific setups. That means tire selection starts with the exact sub-model and actual wheel on the vehicle, not with a general Regal Sportback search that assumes every trim uses the same fitment.
Choosing the Right Tire
What should I consider when choosing a 2020 Buick Regal Sportback tire?
Start with the correct primary size for the car: 225/55R17, 245/45R18, or 245/40R19. From there, compare radial tire series, rim-width compatibility, sidewall style, and product character, since the available choices range from performance-oriented blackwall designs to more appearance-focused selections in certain sizes.
The 225/55R17 fitment offers the widest appearance spread, including blackwall, whitewall, and redline options, while 245/45R18 and 245/40R19 focus on blackwall performance-style radials. Matching the tire to the vehicle’s actual wheel setup and the owner’s driving and appearance goals will narrow the field quickly.
What sidewall styles are available for 2020 Buick Regal Sportback tires?
Sidewall style depends on the Regal Sportback’s tire size. Blackwall options are available across all three primary sizes, while 225/55R17 also includes BFGoodrich Silvertown Radial choices with a 1.50 inch whitewall and a redline sidewall treatment.
That means appearance flexibility is strongest on 17-inch cars, especially Base models and some Preferred configurations. Buyers using 18-inch or 19-inch wheels will be comparing mostly blackwall radials, so the deciding factors there shift more toward tire series, brand selection, and the overall look of a modern performance-style tire.
What brands offer tires for the 2020 Buick Regal Sportback?
BFGoodrich offers tires across all three primary sizes used on the 2020 Buick Regal Sportback. Nitto also appears in the 245/45R18 fitment, giving 18-inch cars an additional brand option alongside the BFGoodrich g-Force selections.
Brand choice should still come after size and wheel confirmation, since not every brand appears in every Regal Sportback fitment. Once the correct size is established, compare the available series within that size and focus on details such as sidewall presentation, rim-width range, and the type of driving the car is most likely to see.
Restoration & Appearance
Which tire should I choose for a period-style 2020 Buick Regal Sportback?
A period-style approach for a 2020 Buick Regal Sportback still starts with the correct modern radial size for the trim. Among the available choices, 225/55R17 offers the strongest appearance-oriented options through Silvertown Radial versions with either a 1.50 inch whitewall or a redline sidewall.
That makes the 17-inch fitment the most flexible if visual character matters as much as basic replacement. Buyers with 18-inch or 19-inch wheel packages are looking primarily at blackwall radials, so a period-style result there comes more from preserving the correct size and wheel setup than from alternate sidewall treatment.
How does tire construction affect the appearance of a restored 2020 Buick Regal Sportback?
For the 2020 Buick Regal Sportback, construction does not create a bias-ply versus radial decision because the primary fitments are radial across the board. Appearance differences come more from the tire’s sidewall treatment, profile, and series than from a change in construction type.
The biggest visual split is between blackwall performance-style tires and the whitewall or redline Silvertown Radial options available in 225/55R17. On a restoration-minded or show-focused car, keeping the correct trim-specific size and wheel diameter usually matters more than chasing a look that belongs to a different setup.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2020 Buick Regal Sportback?
Yes. Wheel changes, altered offsets, suspension lowering, spring changes, or body modifications can all affect tire fitment on a 2020 Buick Regal Sportback, even when the tire size itself matches one of the original trim-based sizes such as 225/55R17, 245/45R18, or 245/40R19.
A Regal Sportback that no longer has its original wheel setup should be checked for wheel diameter, width, and clearance at full steering and suspension movement. The Preferred trim especially benefits from careful verification because it can start with either 17-inch or 18-inch fitment depending on how the car is equipped.
What should I inspect before driving a 2020 Buick Regal Sportback on new tires?
Before driving a 2020 Buick Regal Sportback on new tires, inspect wheel condition, confirm the correct tire size for the trim, and verify proper inflation. It is also smart to check for uneven suspension wear, damaged valve stems, and any signs that the previous tires were rubbing or wearing irregularly.
A short clearance check can prevent problems, especially if the car has aftermarket wheels or has been changed from its original ride height. After installation, watch for vibration, pulling, or contact at full lock, since those symptoms can point to wheel balance issues or a mismatch between the tire and wheel setup.
How often should tires on a 2020 Buick Regal Sportback be inspected?
Tires on a 2020 Buick Regal Sportback should be inspected regularly for pressure loss, tread wear, cuts, bulges, and sidewall damage. Cars that sit for longer periods still need routine checks, because age, storage conditions, and underinflation can affect tire condition even when mileage stays low.
A quick visual inspection before longer drives is a sensible habit, especially on a car that is not driven every day. Pay close attention to any change in steering feel, vibration, or uneven wear pattern, since those can signal alignment, suspension, or wheel issues that deserve attention before more miles are added.
