2011 Buick Tire Fitment Guide

2011 Buick vehicles use five tire sizes across three models. The LaCrosse uses 245/50R17, 235/50R18, or 245/40R19; the Lucerne uses 235/55R17 or 245/50R18; and the Regal uses 235/50R18 or 245/40R19. Those sizes mount on 17-inch, 18-inch, or 19-inch wheels depending on the application, and available rim-width guidance includes 6.0 to 8.5 inches for 235/55R17, 6.5 to 8.5 inches for 235/50R18, and 8.0 to 9.5 inches for 245/40R19.

The practical takeaway is that year and make alone are not enough for a correct replacement. A 2011 Buick owner should first identify the model, then confirm the actual tire size or wheel diameter on the car, especially because LaCrosse spans three different fitments and both Lucerne and Regal can be found with more than one wheel package.

On a 2011 Buick, 235/50R18 is a metric radial size. The 235 is the section width in millimeters, 50 is the aspect ratio, meaning the sidewall height is 50 percent of the section width, R indicates radial construction, and 18 is the wheel diameter in inches. This size appears on certain LaCrosse and Regal applications.

That code matters because each part affects how the tire fits the wheel and sits on the car. Staying with 235/50R18 keeps you in the original 18-inch fitment family for those Buick models, while still leaving room to choose among different tread designs and sidewall treatments within the same basic dimensional envelope.

No. The 2011 Buick lineup uses different sizes depending on the model and wheel package. LaCrosse spans 17-inch, 18-inch, and 19-inch fitments, Lucerne uses either 235/55R17 or 245/50R18, and Regal uses 235/50R18 or 245/40R19. Some sizes are shared between models, but no single size fits the full 2011 Buick range.

That matters because a tire that fits one 2011 Buick sedan may be wrong for another even though the cars are from the same year and make. If you are replacing tires on a Lucerne, LaCrosse, or Regal, use the model name and the size already mounted on the car as the starting point instead of assuming another Buick sedan used the same fitment.

Sidewall style depends on the size. The 235/50R18 and 245/40R19 options are Blackwall only, 235/55R17 is available in Blackwall, Goldline, and Wide Whitewall, and 245/50R18 is available in RWL and Redline. That means the Lucerne has the broadest appearance range, while LaCrosse and Regal fitments remain more contemporary in look.

For most 2011 Buick owners, Blackwall is the most factory-appropriate visual choice because it matches the era's mainstream OE appearance. Goldline, whitewall, redline, or raised white letter styles are more of a personal styling decision, so they make the most sense when the goal is to emphasize the car's dressy character rather than preserve a stock late-model look.

2011 Buick fitments are covered by BFGoodrich, Nitto, American Classic, and Pro-Trac. BFGoodrich appears in 235/50R18, 245/40R19, and 235/55R17; Nitto appears in 235/50R18; American Classic appears in 235/55R17; and Pro-Trac appears in 245/50R18. Brand availability changes by size, so the exact choice depends on the model and wheel package.

That size-by-size spread affects both appearance and intended use. A Lucerne owner shopping 235/55R17 has access to traditional dress sidewalls through American Classic as well as more modern Blackwall choices, while a Regal or LaCrosse owner in 19-inch trim is focused on BFGoodrich radial performance-oriented options within the correct dimensional category.

In 235/50R18 for a 2011 Buick, both BFGoodrich and Nitto offer radial Blackwall tires with W speed ratings up to 168 mph. The BFGoodrich options include tires weighing about 26 to 29 pounds, while the Nitto NT555 G2 comes in at 27.86 pounds and carries a 101W XL marking with a maximum load of 1,819 pounds at 50 psi. Rim-width guidance remains in the same general range, centered around 6.5 to 8.5 inches.

For a buyer, the real difference is in product character within the same factory size rather than a change in fitment. If your 2011 Buick uses 235/50R18, compare the individual tire's load marking, tread style, and intended road use once you have settled on keeping the original size, because the dimensional fit remains the same while the personality of the tire can change.

Rim-width guidance varies by size on 2011 Buick applications. For 235/55R17, the range runs from 6.0 to 8.5 inches. For 235/50R18, the range is 6.5 to 8.5 inches, and for 245/40R19, it is 8.0 to 9.5 inches. Those figures are tied to the tire size itself, not to every Buick wheel across the lineup.

That is why wheel verification matters before replacing tires, especially on cars that may have changed wheels since new. If your 2011 Buick has aftermarket wheels or a different trim package than expected, confirm both the wheel diameter and the wheel width before choosing a tire so the size and the wheel work together correctly.

The 2011 Buick sizes covered here are modern radial fitments, and none of the available products carry a tube-type marking. That places these applications in the tubeless category rather than the older tube-type construction associated with earlier collector vehicles. Tube-related fitment concerns are not a normal part of these Buick applications.

Even so, a tubeless tire still depends on the condition of the wheel and valve stem. When replacing tires on a 2011 Buick, inspect the bead seat, replace aging valve stems, and make sure the wheel is free from corrosion or damage that could affect air retention over time.

No, because 2011 Buick vehicles use multiple wheel diameters. The sizes here mount on 17-inch, 18-inch, or 19-inch wheels, so a 17-inch tire cannot be used on an 18-inch or 19-inch wheel, and the reverse is equally true. Original wheels can be reused only with the tire size family that matches their diameter.

That means a LaCrosse owner should confirm whether the car has its 17-inch, 18-inch, or 19-inch wheel package before shopping, and Lucerne or Regal owners should do the same with their respective wheel options. Checking the sidewall code already on the car is often the fastest way to avoid ordering a diameter that will not physically mount.

A 2011 Buick should be stored on clean, properly inflated tires in a cool, dry space away from direct sunlight, electric motors, welders, and other ozone-producing equipment. Radial tires generally tolerate storage better than older bias-ply designs, but they still age when they sit. Keeping the car out of standing moisture and off contaminated concrete also helps preserve the rubber.

If the Buick will sit for an extended period, move it occasionally to change the tire's contact patch or support it in a way that reduces long-term loading if the storage plan allows for that. A simple storage routine can do as much for tire life as low annual mileage, especially on a sedan that sees seasonal or occasional use.

On a 2011 Buick, tire age matters more than mileage in many cases because these cars are often driven less than modern daily transportation. A sound rule is to begin evaluating tires closely once they reach about five to seven years of age and to consider replacement around ten years regardless of tread depth. The DOT date code on the sidewall is the best way to judge the tire's age.

That approach is especially important if the car appears to have plenty of remaining tread but has spent years parked indoors or driven only on weekends. Rubber hardens over time, and the tire can age out before it wears out, so age should be part of every replacement decision on a 2011 Buick.

Tires on a 2011 Buick should be checked before every drive and inspected more carefully before any extended outing. Look for sidewall cracking, cuts, bulges, uneven wear, punctures, and pressure loss, and make sure the tread is wearing evenly across the tire. Valve stems also deserve attention because they age along with the tire.

That routine matters even more on a lower-mileage car because deterioration can happen during storage rather than on the road. A quick walk-around before driving and a more thorough inspection a few times per season can catch the problems that matter most long before they turn into a roadside issue.

Yes, the radial sizes used on 2011 Buick vehicles are appropriate for normal highway use when they are in good condition, correctly inflated, and matched to the proper wheel. Where speed ratings are shown, the 235/50R18 and 235/55R17 BFGoodrich and Nitto options carry W ratings up to 168 mph, while 245/40R19 options range from W at 168 mph to Y at 186-plus mph. Those ratings exceed the speeds these Buicks would ordinarily see in real-world touring.

The more important safety question is usually the condition of the car and the tire, not the theoretical speed ceiling. On a 2011 Buick, suspension wear, alignment, brake condition, and tire age will influence highway confidence more directly than whether the tire's speed rating is W or Y during normal legal road use.

Inflation pressure for a 2011 Buick should start with the vehicle's factory tire placard or owner's manual, because Buick set the operating pressure around the car's weight, suspension, and original tire size. Some available tires also carry maximum load and pressure figures, such as 1,609 pounds at 51 psi for one 235/50R18 application, 1,819 pounds at 50 psi for another 235/50R18, 1,929 pounds at 50 psi for one 235/55R17, and 1,653 pounds at 35 psi for another 235/55R17.

Those sidewall figures are not universal running-pressure recommendations for every 2011 Buick tire. Use them as the tire's rated upper reference, then set the car according to Buick's specification or the tire manufacturer's guidance for that specific product and size rather than borrowing a pressure figure from a different size or series.

Before a longer drive in a 2011 Buick, inspect the tires for cracking, bulges, cuts, punctures, uneven wear, and proper cold inflation pressure. Check the spare as well, since an older spare is often overlooked even when the four road tires have been replaced. A visual review of valve stems and the wheel bead area is also worthwhile on a car that may have spent time parked.

Tires are only one part of the pre-trip routine on a car of this age. It also makes sense to look over brakes, fluid levels, battery condition, and suspension basics before covering real distance, because a sound tire cannot compensate for neglected mechanical systems elsewhere on the Buick.