The 2013 Buick Regal sits in the modern sport-sedan part of Buick history, blending a more European-flavored chassis feel with the comfort and road manners buyers still expected from the nameplate. That makes tire choice especially important, because the Regal’s stance and personality change noticeably with wheel and tire package. This model uses radial tire fitments in 235/50R18, 245/40R19, and 255/35R20, depending on sub-model and wheel setup. Available choices range from blackwall performance-oriented lines to redline and raised white letter styles in select sizes. The key is matching the exact size to the car first, then choosing the look and driving character that suit your Regal.
Which Tire Size Is Right for The 2013 Buick Regal
The 2013 Buick Regal uses three primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. Base, Turbo, and GS versions do not all share the same fitment, so the first step is confirming the car’s trim and whether it is running 18-inch, 19-inch, or 20-inch wheels. Once that is settled, the decision becomes choosing among the available radial tire lines, sidewall styles, and performance-oriented product options within the correct size.
235/50R18 is a metric radial size in which 235 is the section width in millimeters, 50 is the aspect ratio, and 18 is the rim diameter in inches. On the 2013 Buick Regal, this size is part of the primary fitment range and suits 18-inch wheel applications used on certain sub-models. Product choices include BFGoodrich, Nitto, and Pro-Trac, with blackwall, redline, and raised white letter sidewall treatments available. This size is the right place to focus if your Regal uses the 18-inch package and you want to compare both modern performance styling and more appearance-driven alternatives.
245/40R19 is a metric radial size that uses a 245-millimeter section width, a 40-series profile, and a 19-inch rim diameter. For the 2013 Buick Regal, it belongs to specific 19-inch wheel applications rather than the entire model line, so it should be matched to the actual sub-model and wheel setup. Available options center on BFGoodrich g-Force series tires in blackwall form, giving this size a more focused product mix. It is the correct size to evaluate when your Regal carries the 19-inch fitment and you want a modern radial in the proper profile family.
255/35R20 is a metric radial size with a 255-millimeter section width, a low 35-series profile, and a 20-inch rim diameter. On the 2013 Buick Regal, this size is used on 20-inch applications tied to specific sub-model fitment rather than across the full range. BFGoodrich, Nitto, and Pro-Trac options are available here, with blackwall, redline, and raised white letter choices that can change the car’s visual presentation significantly. This is the size to review when your Regal has the larger wheel package and you want to balance correct fitment with the desired appearance.
Tire fitment on the 2013 Buick Regal varies by sub-model, and that makes trim identification essential before choosing a tire. Base, Turbo, and GS versions do not all use the same size, and some sub-models span more than one wheel diameter.
1
2013 Buick Regal Base
The 2013 Buick Regal Base uses the 235/50R18 radial fitment. That makes selection relatively straightforward, with the main choices centering on blackwall versus redline or raised white letter styling and the specific tire line that best suits how the car is used.
The 2013 Buick Regal GS uses either 245/40R19 or 255/35R20 radial tires, depending on the wheel setup on the car. Choosing for a GS starts with confirming whether it is on 19-inch or 20-inch wheels, then comparing the available product lines and sidewall treatments within that exact size.
The 2013 Buick Regal Turbo uses 235/50R18 or 245/40R19 radial tires, so this sub-model does not rely on a single universal size. Tire selection begins with verifying the installed wheel diameter, after which the decision shifts to the available radial tire series and appearance options in the correct fitment.
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 2013 Buick Regal Tires for Sale
Available 2013 Buick Regal tires center on radial fitments from BFGoodrich, Nitto, and Pro-Trac. Depending on size, buyers can compare g-Force and NT555 G2 performance-oriented lines along with Street Pro III options in blackwall, redline, and raised white letter form.
Owners shopping tires for a 2013 Buick Regal usually need to sort out the exact size by sub-model and wheel diameter first. From there, the important questions move to rim fitment, sidewall style, product differences, and the checks worth making before regular road use.
Tire Size & Fitment
What tire size fits a 2013 Buick Regal?
The 2013 Buick Regal uses three primary tire sizes: 235/50R18, 245/40R19, and 255/35R20. The correct size depends on the sub-model and wheel package, with the Base using 235/50R18, the GS using 245/40R19 or 255/35R20, and the Turbo using 235/50R18 or 245/40R19.
That means the first step is identifying the exact trim and confirming the wheel diameter on the car. A Regal that has been fitted with different wheels over time may no longer match its original setup, so checking the actual tire size on the sidewall and the installed rim diameter helps narrow the selection before comparing brands or sidewall styles.
What size rim does a 2013 Buick Regal use?
A 2013 Buick Regal uses 18-inch, 19-inch, or 20-inch rims depending on the tire size and sub-model configuration. The 235/50R18 fitment uses an 18-inch rim, the 245/40R19 fitment uses a 19-inch rim, and the 255/35R20 fitment uses a 20-inch rim.
Rim diameter should be confirmed before anything else because none of these sizes cross over to a different wheel diameter. Once the rim size is verified, it becomes much easier to compare the tire choices that belong on that wheel, including whether the available options are strictly blackwall or also include redline or raised white letter styling.
Why does the 2013 Buick Regal have more than one tire size?
The 2013 Buick Regal has more than one tire size because fitment changes with sub-model and wheel package. Base, Turbo, and GS versions were not all configured the same way, and even within the Turbo and GS ranges there are multiple wheel diameters tied to different primary tire sizes.
That variation matters because the right tire is not chosen by model name alone. Trim badge, wheel diameter, and the actual size currently mounted on the car should all be checked together, especially if the Regal has seen wheel changes, suspension work, or replacement tires that may not reflect the original setup.
Choosing the Right Tire
What should I consider when choosing a 235/50R18, 245/40R19, or 255/35R20 tire for a 2013 Buick Regal?
Start with the exact size required for the car, because the 2013 Buick Regal does not use one universal fitment. After that, compare the available radial tire lines by rim-width compatibility, sidewall treatment, brand, and any load figures that are relevant to the specific product under consideration.
Appearance and intended use both matter once the size is settled. Some Regal owners may want a straightforward blackwall performance look, while others may prefer redline or raised white letter styling in sizes where those options exist. Matching the tire to the wheel package and the way the car is driven will narrow the field quickly.
What sidewall styles are available for 2013 Buick Regal tires?
Sidewall choices for the 2013 Buick Regal include blackwall across all three primary sizes, with redline and raised white letter options appearing in select 18-inch and 20-inch fitments. Those added appearance choices are found in certain Pro-Trac Street Pro III applications rather than across every available tire line.
That makes sidewall style a secondary decision after size and wheel diameter are confirmed. A Base model on 235/50R18 has more appearance variation than a 19-inch application centered on blackwall performance tires, so the look you want may influence which correct-size products deserve the closest comparison.
What brands offer tires for the 2013 Buick Regal?
Tires for the 2013 Buick Regal are available from BFGoodrich, Nitto, and Pro-Trac across the primary 18-inch, 19-inch, and 20-inch fitments. Depending on size, the selection includes g-Force series options, NT555 G2, and Street Pro III products, all in radial construction.
Brand choice should be weighed alongside the exact size, wheel diameter, and the kind of presentation you want from the car. Some sizes offer a broader mix of brands and sidewall styles, while others stay more narrowly focused, so the strongest comparison often comes from looking at what is actually offered within your Regal’s specific fitment.
Restoration & Appearance
Which tire should I choose for a period-style 2013 Buick Regal?
A period-style 2013 Buick Regal still needs the correct modern radial size for its trim and wheel package, so fitment comes first. Once that is established, appearance becomes the main separator, with blackwall choices delivering a cleaner late-model look and select redline or raised white letter options adding a more assertive visual character.
The best direction depends on how the car is being presented. A more understated Regal may suit a blackwall tire, while a sportier build may benefit from the bolder sidewall treatments available in certain sizes. Keeping the size and wheel diameter correct will preserve the car’s stance better than chasing appearance alone.
How does tire construction affect the appearance of a restored 2013 Buick Regal?
On a 2013 Buick Regal, construction is less about bias-ply versus radial and more about selecting the right modern radial tire in the proper profile. The visible changes come mostly from sidewall design, tread presentation, and the relationship between the tire’s profile and the wheel diameter used on Base, Turbo, or GS applications.
That means appearance is strongly tied to choosing the correct 18-inch, 19-inch, or 20-inch fitment before comparing style details. A low-profile 20-inch setup presents the car very differently from an 18-inch package, even before sidewall treatment enters the picture, so trim level and wheel package should guide any restoration-oriented decision.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2013 Buick Regal?
Yes, modifications can affect tire fitment on a 2013 Buick Regal. Aftermarket wheels, changes in wheel width, suspension lowering, alignment changes, or body modifications can alter the way 235/50R18, 245/40R19, or 255/35R20 tires sit in the wheel opening and how much clearance they have during steering and suspension travel.
A Regal that no longer has its original wheel setup should be checked carefully before any replacement tire is chosen. Verifying the installed rim diameter, measuring wheel width where possible, and checking for rubbing at full lock or over compression will help prevent choosing a size that matches the sidewall label but not the actual car.
What should I inspect before driving a 2013 Buick Regal on new tires?
Before driving a 2013 Buick Regal on new tires, inspect the wheel condition, confirm the tire size matches the car’s trim and rim diameter, and make sure the tires are seated and inflated properly. It is also worth checking for uneven wear clues that could point to alignment, suspension, or balance issues already present on the car.
A short road test should be followed by another look at pressure, sidewall condition, and any signs of contact inside the wheel well. Paying attention to steering feel, vibration, and straight-line tracking early on can catch a mismatch in setup before it turns into premature wear or an ongoing fitment problem.
How often should tires on a 2013 Buick Regal be inspected?
Tires on a 2013 Buick Regal should be inspected regularly, not just when tread looks low. Monthly pressure checks, routine visual inspection of tread and sidewalls, and a closer look before longer drives are sensible practice, especially on a car that may alternate between daily use and extended periods of sitting.
Inspection should include looking for cuts, bulges, sidewall cracking, punctures, and uneven wear across the tread face. Any Regal that sits for long stretches also benefits from checking for flat spotting and slow air loss, since time, storage conditions, and inactivity can affect tire condition even when mileage stays relatively low.
