2012 Buick Tire Fitment Guide

2012 Buick vehicles use six sizes across three models: 235/50R17, 235/50R18, 245/40R19, 245/50R17, 255/35R20, and 235/45R18. The LaCrosse uses 235/50R17, 235/50R18, 245/40R19, and 245/50R17. The Regal uses 235/50R17, 235/50R18, 245/40R19, and 255/35R20. The Verano uses 235/45R18. Rim diameters span 17, 18, 19, and 20 inches, and rim-width guidance where available runs from 6.5 inches to 10.0 inches depending on size.

That spread means year and make alone are not enough for a confident tire choice on a 2012 Buick. Start by confirming the exact model, then verify the wheel diameter already on the car and compare the existing sidewall size marking. Once those basics match, you can narrow the selection by brand, speed rating, and the wheel-width range that fits your wheel package.

On a 2012 Buick, 235/50R18 is a metric radial tire 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 both the 2012 Buick LaCrosse and 2012 Buick Regal.

That code matters because a 235/50R18 cannot be substituted casually with a 17-, 19-, or 20-inch size from another 2012 Buick wheel package. Even though LaCrosse and Regal can share this size, the correct choice still depends on the actual wheels installed on the car. Checking the sidewall on the current tires is usually the fastest way to confirm whether 235/50R18 is the intended fitment.

No, 2012 Buick models do not all use the same tire size. The LaCrosse and Regal share several sizes, including 235/50R17, 235/50R18, and 245/40R19, but the LaCrosse also uses 245/50R17 and the Regal also uses 255/35R20. The Verano stands apart with 235/45R18. That means the 2012 Buick range includes both shared and model-specific tire applications.

For a buyer, that makes model identification the first real filter. A LaCrosse owner cannot assume a Regal size will transfer, and a Verano owner should not use the larger car's size range as a guide. If the car has changed hands or wheels have been swapped at some point, compare the tire sidewall and wheel diameter with the original fitment path before settling on a replacement.

The available 2012 Buick tire sizes here use blackwall sidewalls across the active product range. That applies to 235/50R17, 235/50R18, 245/40R19, 255/35R20, and 235/45R18. The overall look is consistent with modern late-model Buick fitments, especially on sedans that originally relied on contemporary low-profile radial designs rather than vintage whitewall styling.

For most 2012 Buick owners, that means the visual decision is simpler than on older collector cars where wide whitewall or redline choices affect authenticity. The more meaningful choice is usually wheel diameter, section width, and the type of driving the car sees. If appearance still matters to your project, focus on keeping the overall stance and profile appropriate to the model rather than trying to force an older-style sidewall treatment onto a modern Buick.

BFGoodrich appears across every active 2012 Buick product size here, while Nitto also covers 235/50R18 and 255/35R20. The 235/50R17, 245/40R19, and 235/45R18 sizes are represented by BFGoodrich. Within the shared sizes, BFGoodrich covers both the LaCrosse and Regal applications, and Nitto adds another option in selected 18- and 20-inch fitments.

Brand choice matters most once the size and wheel diameter are already confirmed. A LaCrosse or Regal owner running 235/50R18 has a broader brand choice than someone replacing 235/50R17, while a Verano owner in 235/45R18 stays within a narrower brand range. If you are comparing options, use the size first and then sort by the speed rating, wheel-width range, and overall character of the tire series.

On 2012 Buick sizes where both appear, such as 235/50R18, 245/40R19, 255/35R20, and 235/45R18, both are radial blackwall tires from BFGoodrich and both commonly carry W speed ratings. In 235/50R18, the two share the same 6.5- to 8.5-inch rim-width range, while the Sport Comp 2 carries a 1609-pound maximum load at 51 psi and the Comp 2 A/S product shown does not include that same load figure. In 245/40R19, both fit 8.0- to 9.5-inch rims.

For a 2012 Buick owner, the practical comparison is less about basic fitment and more about choosing within the same size family. Because both series stay within the same wheel-diameter application, the better approach is to compare the exact size you need, then review the speed rating, any stated load figure, and the wheel-width range that matches your rim. Keeping the size correct matters more than choosing between two similar series names.

Rim-width guidance varies by size on 2012 Buick applications. The 235/50R17 and 235/50R18 sizes fit rims from 6.5 to 8.5 inches wide. The 245/40R19 size fits 8.0 to 9.5 inches. The 255/35R20 size fits 8.5 to 10.0 inches. The 235/45R18 size fits 7.5 to 9.0 inches. Those ranges are specific to each size and should not be transferred from one fitment to another.

This matters most when a 2012 Buick has aftermarket wheels or when a buyer is moving between factory wheel packages. A tire may share the same rim diameter as another option yet still need a different wheel width to fit properly. Before mounting anything, measure or verify the actual wheel width and match it to the size you intend to run rather than assuming all 18-inch or all 19-inch Buick wheels are interchangeable.

The active 2012 Buick fitments here are radial passenger-car sizes, and none of the size markings include tube-type notation. The available products are presented as modern radial applications with standard contemporary sizing formats such as 235/50ZR18 and 245/40ZR19. That points buyers toward tubeless-style fitments rather than the tube-type construction commonly associated with older collector-era tires.

Even so, wheel condition still matters. If a 2012 Buick is running damaged, corroded, or nonstandard wheels, the sealing surface should be checked carefully before mounting any tire. A buyer should also confirm the exact sidewall marking on the chosen product and inspect the valve stems at the same time, since air retention problems on newer cars are often a wheel or valve issue rather than a tire-construction issue.

A 2012 Buick should be stored on clean, properly inflated tires in a cool, dry space away from direct sunlight, electric motors, welders, battery chargers, and other ozone-producing equipment. Long static storage can age any radial tire through time as much as through mileage, especially when the car sits on one spot for months. Keeping the tires out of standing moisture and away from petroleum contamination also helps preserve the rubber.

If the car is stored seasonally, move it periodically so the tires do not remain under the same load patch for the entire off-season. Owners who store the vehicle for longer stretches often benefit from using tire cradles or appropriately supporting the car to reduce prolonged stress on the contact area. A final pressure check before and after storage helps catch a slow leak before it becomes a wheel or sidewall problem.

On a 2012 Buick, tire age is usually as important as tread depth. Collector and low-mileage cars often reach an age where the rubber hardens or cracks before the tread is worn out. A sensible rule is to evaluate tires closely once they are five to seven years old and to consider replacement around the ten-year mark regardless of mileage, using the DOT date code to confirm the tire's age.

That guidance is especially useful for a 2012 Buick that sees occasional use, because a car that looks lightly driven can still be riding on aged rubber. Dry cracking, hardening, vibration, or loss of wet-weather confidence can all appear before the tread seems used up. When the tire's age and its condition disagree, condition and age should win over remaining tread depth.

Tires on a 2012 Buick should be inspected before every drive and given a more thorough check before any highway trip or extended outing. Look for sidewall cracking, cuts, punctures, unusual tread wear, bulges, and signs of repeated pressure loss. On late-model radial fitments like these, pressure retention and valve-stem condition are just as important as visible tread condition.

That routine matters because a sedan that spends much of its time parked can still develop age-related issues between drives. A quick inspection catches problems while they are still manageable and helps prevent vibration, poor tracking, or a roadside failure. If one tire shows unusual shoulder wear or repeated low pressure, inspect the alignment and wheel condition as part of the same maintenance step.

The 2012 Buick LaCrosse belongs to an era when radial construction was standard equipment, and its size range here reflects that with 235/50R17, 235/50R18, 245/40R19, and 245/50R17. Those sizes correspond to different wheel packages rather than an older-style bias-ply versus radial transition. No authentic restoration question here revolves around vintage construction; the focus is staying with the correct modern size and wheel diameter for the specific car.

For an owner trying to return a LaCrosse to factory-style presentation, the most important step is verifying the original wheel package on that specific car. Window stickers, build information, Buick literature, and model-specific enthusiast sources can help confirm whether the car should be on 17-, 18-, or 19-inch wheels. Once that is settled, the right radial size follows much more naturally.

Yes, correct tire fitment still matters when showing a 2012 Buick, even though it is a modern car rather than an early collector-era vehicle. Judges and knowledgeable enthusiasts notice whether the tire size matches the wheel package, whether the profile looks appropriate for the model, and whether the overall stance appears factory-correct. On a 2012 Buick, the most obvious mismatch would be an incorrect wheel diameter or an overly aggressive profile that alters the car's visual balance.

The practical takeaway is that authenticity here is less about vintage sidewall styling and more about maintaining the right modern specification. A LaCrosse on the wrong aspect ratio, a Regal wearing a mismatched wheel package, or a Verano carrying an incorrect diameter can look off immediately. If the car is headed for marque judging or preservation-oriented display, verify the original wheel-and-tire combination against Buick reference material before finalizing the setup.

The clearest overlap between BFGoodrich g-Force Phenom T/A and Nitto NT555 G2 for a 2012 Buick appears in 235/50R18 and 255/35R20. In 235/50R18, both are radial blackwall tires, both carry a W speed rating, and both reach a maximum load of 1819 pounds at 50 psi where load figures are stated. In 255/35R20, both are radial blackwalls as well, while the Phenom T/A carries a Y speed rating with a 186+ mph ceiling and the Nitto carries a W rating with a 168 mph ceiling.

For a 2012 Buick owner, that means the comparison should be made inside the exact size the car uses rather than by brand name alone. In 235/50R18, the two are close in basic paper specs, so wheel-width fit and tire-series preference become the tie-breakers. In 255/35R20, the speed-rating difference is more noticeable, but the correct choice still depends first on the Regal's wheel package and how the car is actually used.

The 2012 Buick tire options here are modern radial fitments with W and Y speed-rated products available, depending on size. W carries a 168 mph ceiling, and Y carries a 186+ mph ceiling. Those ratings are well beyond normal legal highway speeds, so for real-world use the condition, age, inflation, and proper fitment of the tire matter far more than the headline speed letter on a healthy street-driven Buick sedan.

A sound 2012 Buick on the correct size and a well-maintained set of tires can be entirely appropriate for highway use, but the tire is only one part of the equation. Alignment, suspension condition, brakes, and wheel integrity all influence stability and confidence at speed. If the car has older tires with plenty of tread but visible age, replacing them is usually a more meaningful safety step than chasing a higher speed rating.

Inflation pressure on a 2012 Buick should follow the vehicle placard or owner's manual for normal service, while the tire's own maximum-pressure marking should never be mistaken for the everyday operating target. Some available tires also show load-and-pressure figures: 235/50R18 reaches 1609 pounds at 51 psi in one BFGoodrich version and 1819 pounds at 50 psi in other versions, 245/40R19 reaches 1653 pounds at 50 psi, 255/35R20 reaches 1609 pounds at 50 psi, and 235/45R18 reaches 1653 pounds at 50 psi.

Those figures are useful for understanding the tire's capacity, but they are not a blanket recommendation for routine street inflation. A LaCrosse, Regal, and Verano do not necessarily use the same pressure even when two cars share a size. The correct approach is to start with Buick's factory guidance for the specific model and wheel package, then make only small adjustments if the tire manufacturer or a marque specialist recommends them.

Before a longer drive in a 2012 Buick, inspect all four tires for cracking, cuts, punctures, bulges, uneven wear, and proper cold inflation pressure. Check the spare as well, especially if it has remained untouched for years. Make sure the wheels are free of obvious damage and the valve stems are in good condition. On sizes that carry higher speed ratings, the tire still needs to be in sound condition to deliver stable road manners.

That tire inspection should be part of a broader pre-trip routine on any aging modern car. Wheel alignment, brake feel, fluid condition, and suspension behavior all deserve attention before a longer run. If the car pulls, vibrates, or loses pressure during local driving, solve that issue before taking the Buick farther from home, because long-distance comfort and safety depend on the whole chassis working together.