2013 Buick Tire Fitment Guide

2013 Buick vehicles use six tire sizes across three models: 235/50R17, 235/50R18, 245/50R17, 245/40R19, 255/35R20, and 235/45R18. LaCrosse uses 235/50R17, 235/50R18, 245/50R17, and 245/40R19; Regal uses 235/50R18, 245/40R19, and 255/35R20; Verano uses 235/45R18. The 17-inch sizes mount on wheels in the 17-inch diameter group, the shared 18-inch fitments mount on 18-inch wheels, 245/40R19 mounts on 19-inch wheels, and 255/35R20 mounts on 20-inch wheels.

That spread means year and make alone are not enough for a confident match on a 2013 Buick. Start by confirming whether you have a LaCrosse, Regal, or Verano, then verify the wheel diameter already on the car. Rim width matters too: 235/50R17 fits 6.5 to 8.5 inches, 235/50R18 fits 6.5 to 8.5 inches, 245/40R19 fits 8.0 to 9.5 inches, 255/35R20 fits 8.5 to 10.0 inches, and 235/45R18 fits 7.5 to 9.0 inches.

On a 2013 Buick, 235/50R18 is a metric radial size. The 235 is the nominal section width in millimeters, 50 is the aspect ratio, meaning the sidewall height is 50 percent of that width, R identifies radial construction, and 18 is the wheel diameter in inches. This size appears on certain LaCrosse and Regal applications, so it is one of the shared fitments within the 2013 Buick range.

The practical point is that 235/50R18 is not interchangeable with the 17-, 19-, or 20-inch Buick sizes simply because the first number looks similar. The wheel diameter has to match, and the wheel width also needs to fall within the approved range for the tire. If your 2013 Buick carries an 18-inch wheel and the placard or current tire confirms 235/50R18, you can then compare brands and tire series without changing the basic fitment.

No, 2013 Buick models do not all use the same tire size. LaCrosse has four fitments, Regal has three, and Verano has one. Two sizes are shared across models: 235/50R18 and 245/40R19 both appear on LaCrosse and Regal. The other sizes are model-specific within the year, including 235/50R17 and 245/50R17 for LaCrosse, 255/35R20 for Regal, and 235/45R18 for Verano.

That matters because a 2013 Buick owner can easily end up searching by year and make and still land on the wrong wheel diameter. A Regal with 20-inch wheels needs a very different tire than a Verano on 18s or a LaCrosse on 17s. Before comparing tread patterns or brand names, verify the model and read the existing sidewall or door placard so your search stays within the correct size family.

2013 Buick fitments in this range are available in Blackwall sidewall style across the active product selection. That includes 235/50R17, 235/50R18, 245/40R19, 255/35R20, and 235/45R18. The overall look is consistent with contemporary Buick sedans, especially LaCrosse, Regal, and Verano models equipped with late-model alloy wheel packages rather than whitewall-oriented vintage styling.

For a 2013 Buick, sidewall choice is more about matching the modern character of the car than chasing a period whitewall appearance. Blackwall keeps the look clean and factory-appropriate for this era, whether the goal is a preserved original daily driver or a well-kept modern collectible. Once the sidewall appearance is settled, the next comparison should be among the available performance-oriented radial series in the correct size.

BFGoodrich and Nitto cover the active 2013 Buick fitments here. BFGoodrich appears in 235/50R17, 235/50R18, 245/40R19, 255/35R20, and 235/45R18, while Nitto appears in 235/50R18 and 255/35R20. Across those sizes, the focus is on modern radial performance-oriented lines with Blackwall sidewalls rather than nostalgic or period-reproduction designs.

Brand choice on a 2013 Buick usually comes after the size is locked down. A LaCrosse or Regal owner in 235/50R18 has more than one brand path available, while some other sizes stay within one brand family. That makes it smart to identify the size first, then compare tire series inside that size for load rating, rim-width compatibility, and the kind of road use you expect from your Buick.

For 2013 Buick fitments where both appear, BFGoodrich g-Force Sport COMP-2 and BFGoodrich g-Force COMP-2 A/S share the same basic radial format, Blackwall styling, and W speed rating in sizes such as 235/50R18 and 245/40R19. In 235/50R18, both fit 6.5 to 8.5-inch rims, while the Sport COMP-2 carries a stated load figure of 1609 pounds at 51 psi and the A/S version appears without that same paired load-and-pressure notation. In 245/40R19, both fit 8.0 to 9.5-inch rims, again with the Sport COMP-2 carrying a stated 1653-pound-at-50-psi figure.

On a 2013 Buick, that means the comparison should focus on the exact series characteristics you want within the same size rather than wondering whether one changes the wheel fitment. The dimensions and wheel compatibility stay closely aligned, so your real job is to choose the series that best matches how the car will be used. If your Buick sees varied road use, compare the sidewall markings and service description on the exact product before deciding.

Rim width requirements vary by 2013 Buick tire size. The 235/50R17 size fits 6.5 to 8.5-inch rims, 235/50R18 fits 6.5 to 8.5 inches, 245/40R19 fits 8.0 to 9.5 inches, 255/35R20 fits 8.5 to 10.0 inches, and 235/45R18 fits 7.5 to 9.0 inches. Those ranges matter just as much as wheel diameter, because the correct tire size still needs the right wheel width to maintain its intended profile.

A 2013 Buick owner should confirm the wheel width before moving between tire series in the same size, especially on 19- and 20-inch applications where the profile is lower and the fit is less forgiving. If your wheel sits near the narrow or wide end of the approved range, that can influence how the tire looks and how the sidewall stands on the wheel. Verifying both diameter and width avoids fitment surprises.

The active 2013 Buick fitments here are modern radial tires with no tube-type marking in the size descriptions. That points to tubeless construction across the available 235/50R17, 235/50R18, 245/40R19, 255/35R20, and 235/45R18 products. These are the kinds of tires typically paired with modern sealed wheels rather than with tube-dependent vintage rim designs.

Even so, tube use should never be assumed solely from the vehicle year. The right check is the specific tire sidewall marking together with the wheel design and condition. On a 2013 Buick with original-style modern wheels, tubeless fitment is the normal expectation, but a damaged wheel bead seat or an aftermarket wheel issue can still cause sealing problems that need correction before mounting new tires.

A 2013 Buick should be stored on clean, properly inflated tires in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment. Modern radial tires resist flat-spotting better than older bias-ply designs, but they still age faster when exposed to heat, ultraviolet light, and long periods of static load on one contact patch.

For a stored LaCrosse, Regal, or Verano, it helps to move the car periodically so the tires do not sit in the same position for months at a time. If the car will be parked long-term, many collectors also use tire cradles or stands to reduce stress on the casing. Storage habits have a real effect on sidewall condition, ride quality, and how ready the Buick feels when it returns to road use.

Tires on a 2013 Buick should be judged by age and condition as much as by tread depth. For collector or low-mileage use, a good rule is to begin careful evaluation around five to seven years and to treat ten years as a serious replacement point regardless of how much tread remains. The DOT date code on the sidewall is the starting point for that age check.

That guideline matters because many Buicks accumulate miles slowly, especially if they are second cars or weekend drivers. A tire can look usable at first glance and still be aging internally. Regularly reading the date code, checking for hardening or cracking, and replacing old tires before a long road trip is usually more important than chasing maximum tread life on a low-use 2013 Buick.

Tires on a 2013 Buick should be inspected before every drive and again before any extended highway outing. Look for sidewall cracking, cuts, bulges, irregular wear, punctures, and signs of pressure loss. On modern tubeless radial tires like these Buick fitments, the valve stem and bead area deserve the same attention as the tread because slow leaks often start there.

A quick walk-around catches problems before they turn into vibration, handling changes, or a roadside failure. If the car has been parked for weeks, check pressure with a gauge rather than relying on appearance, especially on lower-profile 19- and 20-inch sizes where underinflation can be less obvious. Seasonal inspections by a tire professional are a smart added step for any 2013 Buick that is driven infrequently.

A 2013 Buick LaCrosse would have been fitted from new with modern radial tires, not bias-ply construction. Within the LaCrosse range here, the applicable sizes are 235/50R17, 235/50R18, 245/50R17, and 245/40R19, depending on the wheel package and trim configuration. Buick used contemporary metric radial sizing by this period, so matching the original type begins with confirming the exact size and wheel diameter for your car.

For an originality-minded 2013 Buick owner, authenticity is less about reproducing an antique tread pattern and more about staying faithful to the correct modern size, load class, and overall appearance. A Blackwall radial is consistent with the era. If you are preserving a specific trim or market version, the door placard, original handbook, and Buick marque resources are the best places to verify which of the LaCrosse fitments belongs on your particular car.

Yes, correct tire fitment matters on a 2013 Buick if the car is being judged for originality or presented as a well-preserved example. Judges and knowledgeable enthusiasts will notice an incorrect wheel diameter, an obviously wrong aspect ratio, or a tire that changes the car’s stance and overall look. On a late-model Buick, authenticity usually centers on proper metric radial sizing and the right sidewall appearance for the era.

That does not mean every show car needs an identical tire series, but it should look and fit as the car was intended to sit. A Regal wearing a 20-inch fitment presents differently than a LaCrosse on 17s, and mixing those visual cues can stand out immediately. If event standards are strict, use marque clubs and event guidelines to confirm what judges expect for a 2013 Buick in your class.

On 2013 Buick sizes where both appear, such as 235/50R18 and 255/35R20, BFGoodrich g-Force Phenom T/A and Nitto NT555 G2 share Blackwall radial construction but differ in some published service details. In 235/50R18, the Phenom T/A carries a 101W service description with a stated 1819-pound load at 50 psi, while the Nitto NT555 G2 also carries 101W with a stated 1819-pound load at 50 psi and a rim-width range centered on 6.5 to 8.5 inches. In 255/35R20, the Phenom T/A carries a 97Y service description with a stated 1609-pound load at 50 psi, while the Nitto version carries 97W.

For a 2013 Buick owner, that comparison is useful when the fitment is already settled and the choice comes down to details within the same size. The key differences are in the sidewall service markings, published load notation, and in some cases the speed category. If your Buick is shown, preserved, or driven spiritedly, compare the exact service description on the sidewall so the tire matches both the car’s use and your expectations.

Yes, 2013 Buick tires in these sizes are built as modern radial designs and carry W or Y speed ratings where those markings appear. W corresponds to a 168 mph ceiling, while Y corresponds to 186+ mph. Those figures are well beyond ordinary U.S. highway speeds, so on a sound LaCrosse, Regal, or Verano, the tire’s marked speed category is usually not the limiting factor in normal road use.

Highway safety still depends on far more than the speed letter. Tire age, inflation, alignment, suspension condition, and brake condition all matter on a 2013 Buick, especially on cars with lower-profile 19- and 20-inch fitments that react more sharply to underinflation or curb damage. A high speed rating should be treated as a service specification, not as a target, and the whole car should be inspected before regular highway driving.

Inflation pressure on a 2013 Buick should start with the factory recommendation on the door placard or in the owner’s manual, because that pressure is matched to the vehicle’s weight distribution and intended ride and handling balance. Some tire sizes also carry published maximum load and pressure pairings, including 235/50R18 at up to 1819 pounds at 50 psi, 245/40R19 at up to 1653 pounds at 50 psi, 255/35R20 at up to 1609 pounds at 50 psi, and 235/45R18 at up to 1653 pounds at 50 psi.

Those figures are not blanket operating pressures for every 2013 Buick. They are maximum service references tied to the tire, not substitutes for Buick’s recommended cold inflation setting. Do not transfer a pressure figure from one size to another or assume that a 20-inch Regal setup should run the same pressure as a 17-inch LaCrosse. Matching the exact size to the car’s placard keeps the tire working as intended.

Before a longer drive in a 2013 Buick, inspect all four tires and the spare for proper pressure, visible cracking, tread damage, bulges, punctures, and uneven wear. Pay close attention to the sidewalls on lower-profile 19- and 20-inch tires, since impact damage can be easier to miss there. A road-trip check should also include the valve stems, wheel condition, and confirmation that the tire size on the car matches the wheel package you expect.

Tires are only one part of the pre-trip routine on a car of this era, but they are the part in direct contact with the road. If anything looks questionable, address it before departure rather than testing it on the highway. It is also wise to check alignment feel during the first few miles, because a pull, vibration, or steering shimmy can reveal a tire or wheel issue that was not obvious while the Buick was parked.