2017 Buick Tire Fitment Guide

2017 Buick vehicles use six tire sizes across four models: 245/40R20 for the Cascada; 235/50R18 and 245/40R20 for the LaCrosse; 235/50R18, 245/40R19, and 255/35R20 for the Regal; and 225/50R17 plus 235/45R18 for the Verano. Rim diameters therefore span 17, 18, 19, and 20 inches, and each size has its own compatible rim-width range. Examples include 6.0 to 8.0 inches for 225/50R17, 6.5 to 8.5 inches for 235/50R18, 7.5 to 9.0 inches for 235/45R18, 8.0 to 9.5 inches for 245/40R19 and 245/40R20, and 8.5 to 10.0 inches for 255/35R20.

That means year and make alone are not enough to choose the right tire for a 2017 Buick. Start by identifying the exact model, then confirm the wheel diameter already on the car before comparing brands or tread designs. The LaCrosse and Regal overlap on 235/50R18, while the Regal's 19- and 20-inch sizes and the Verano's 17- and 18-inch sizes are more model-specific. Matching the tire to the actual wheel is the first step toward preserving proper stance, clearance, and handling balance.

On a 2017 Buick tire, 245/40R20 is a metric radial size code. The 245 is the nominal section width in millimeters, 40 is the aspect ratio or sidewall height as a percentage of section width, R identifies radial construction, and 20 is the wheel diameter in inches. On 2017 Buick applications, this size is used on the Cascada and on certain LaCrosse configurations, and it appears with W and Y speed ratings depending on the tire chosen.

That decoding matters because 245/40R20 is not interchangeable with the 18-inch or 19-inch sizes used elsewhere in the Buick range for 2017. A buyer comparing a Cascada or LaCrosse should still verify the actual wheel on the car, since the LaCrosse also appears with 235/50R18. Once the wheel diameter is confirmed, the remaining choice comes down to product character, sidewall style, and the speed rating carried by the specific tire rather than whether the size code itself is correct.

No. 2017 Buick models use different tire sizes depending on the model and wheel package. The Cascada uses 245/40R20, the LaCrosse uses either 235/50R18 or 245/40R20, the Regal uses 235/50R18, 245/40R19, or 255/35R20, and the Verano uses 225/50R17 or 235/45R18. Every fitment in this year range is radial, but the wheel diameters and section widths vary enough that the correct model identification is essential.

Practically, that means a 2017 Buick owner should verify model first and wheel diameter second before narrowing the search. The Regal in particular covers three distinct diameters, so assumptions can easily lead to the wrong tire. Shared sizes such as 235/50R18 across LaCrosse and Regal do not mean the whole Buick lineup uses the same fitment. Treat the model badge and the actual tire sidewall as your two quickest checkpoints before replacing anything.

Most 2017 Buick tire sizes here are offered in Blackwall form, which suits the clean, contemporary look Buick used across the Cascada, LaCrosse, Regal, and Verano. The one exception is 245/40R20, where both Blackwall and RWL options appear. That gives owners of the 20-inch Cascada and certain 20-inch LaCrosse applications a little more visual flexibility than the other Buick fitments for this model year.

For a factory-like appearance on a 2017 Buick, Blackwall is the safer visual direction because it matches the restrained styling most buyers expect on a modern luxury-leaning Buick. RWL creates a more assertive look and tends to suit owners who want a sportier presentation. Since sidewall appearance does not override the need for the correct size, confirm the exact fitment first and then choose the sidewall style that best matches the character you want the car to project.

BFGoodrich appears across every 2017 Buick size covered here, while Nitto is also available in 245/40R20, 235/50R18, 255/35R20, and 225/50R17. Pro-Trac appears in 245/40R20 as well. The broadest brand mix is in the shared 20-inch and 18-inch sizes, while some fitments such as 245/40R19 and 235/45R18 remain centered on BFGoodrich offerings.

That brand spread gives Buick owners a useful way to narrow choices once the size is settled. If your car uses a more common size such as 235/50R18 or 245/40R20, you have more room to compare series and appearance. If your fitment is more specific, such as 245/40R19 for the Regal, the real focus shifts from brand shopping to finding the right speed rating and wheel-width compatibility within the smaller set of available radial choices.

For several 2017 Buick sizes, BFGoodrich offers both g-Force COMP-2 A/S and g-Force Phenom T/A, and they differ in sidewall code details, load figures, and speed ratings in some fitments. In 245/40R20, for example, the COMP-2 A/S appears with a 99W marking while the Phenom T/A carries a 99Y marking and a published load figure of 1,709 pounds at 50 psi. In 245/40R19, the COMP-2 A/S is marked 94W while the Phenom T/A is marked 98Y. Both remain Blackwall radial tires aimed at modern road use, but the exact specifications are not identical from one series to the other.

That means a 2017 Buick owner should compare the full sidewall code, not just the basic size, before settling on a tire. If you are trying to stay close to a particular load index or want the higher speed ceiling associated with a Y-rated option, those markings can matter. If your priority is keeping a consistent modern look with a mainstream radial design, either series may fit the brief, but it is still smart to match the tire to how the car will actually be driven.

Rim-width requirements for 2017 Buick tires vary by size. The 225/50R17 fits 6.0 to 8.0-inch rims, 235/50R18 fits 6.5 to 8.5-inch rims, 235/45R18 fits 7.5 to 9.0-inch rims, 245/40R19 fits 8.0 to 9.5-inch rims, 245/40R20 fits 8.0 to 9.5-inch rims, and 255/35R20 fits 8.5 to 10.0-inch rims. Those ranges are wide enough that the same wheel diameter does not automatically mean the same wheel width will suit every tire equally well.

The practical takeaway is to confirm both diameter and wheel width before choosing a replacement for a 2017 Buick. A tire can match the correct 18-inch or 20-inch diameter and still be wrong for the wheel if the width falls outside the approved range. This matters most when replacing wheels, correcting a previous modification, or moving between factory wheel packages within the same model line, especially on Regal and LaCrosse applications with more than one size.

The 2017 Buick sizes covered here are modern radial tires, and none of the size markings indicate tube-type construction. They are presented as tubeless radial fitments in the way modern passenger-car tires normally are, with no TT markings appearing in the available size strings. That makes them fundamentally different from antique or early bias-ply applications where tube use is part of the normal setup.

Even so, a 2017 Buick owner should not assume every wheel is ready to seal correctly without inspection. Check for wheel damage, corrosion at the bead seat, and the condition of the valve stem whenever tires are being replaced. If the car has aftermarket wheels or a history of repair work, confirm the wheel's condition before mounting a new tire. Good air retention starts with the wheel and valve hardware just as much as with the tire itself.

A 2017 Buick stored with its tires fitted should be kept in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment. Proper inflation matters during storage, and the car benefits from being moved periodically so the same part of the tread is not carrying the load for months at a time. Because all of these Buick fitments are radial, they generally tolerate storage better than older bias-ply designs, but time and environment still age the rubber.

For longer storage, clean the tires, keep them off oily or damp surfaces, and consider stands or cradles if the vehicle will sit for an extended season. A 2017 Buick that is driven only occasionally can still develop sidewall weathering long before the tread is worn out. Good storage habits help preserve ride quality and appearance, and they reduce the chance of discovering cracking or pressure loss only when the car is finally taken back out on the road.

Tires on a 2017 Buick should be judged by age as much as by tread depth. For a modern radial on a low-use car, a careful inspection around the five- to seven-year point is a sensible routine, and replacement becomes a serious consideration as tires approach roughly ten years from the DOT date code, even if they still look presentable. Heat cycles, storage conditions, alignment, and inflation history all affect the real service life.

That age-based approach is especially important for a Buick that spends more time parked than commuting. A Regal or Cascada might retain plenty of tread while the rubber itself has already hardened or begun to crack, and a Verano or LaCrosse used gently can age the same way. Reading the DOT code and combining it with a close visual inspection gives a more reliable picture than mileage alone when deciding whether the tires are still suitable for continued road use.

Tires on a 2017 Buick deserve a quick inspection before every drive and a more thorough check before any longer trip. Look for sidewall cracking, cuts, punctures, bulges, uneven wear, and changes in tread depth across the tire. Pressure should also be checked regularly, since slow losses can affect ride, braking, and wear patterns even before a problem becomes obvious from the driver's seat.

A short pre-drive walkaround is often enough to catch issues early, especially on cars that are not used every day. On a 2017 Buick with larger 19- or 20-inch fitments, low-profile sidewalls can hide curb damage until you inspect closely. If the car has been sitting, confirm that all four tires and the spare still hold pressure as expected. Small problems become far more expensive once they turn into irregular wear or a roadside failure.

A 2017 Buick Cascada belongs to the modern radial era, so radial construction is the correct original-type approach rather than bias-ply or earlier alphanumeric sizing. Within the fitments covered here, the Cascada uses 245/40R20. That places it squarely in the contemporary metric radial category, which is consistent with how Buick equipped modern front-wheel-drive and premium-leaning passenger cars in this period.

For an owner trying to keep a 2017 Buick Cascada visually and functionally close to original, the main authenticity points are the correct metric size, the correct 20-inch wheel diameter, and a sidewall appearance that suits the car's factory character. Blackwall is usually the most natural match for a modern Buick presentation. If absolute originality matters at a high level, verify market- and trim-specific details through Buick literature or a marque specialist before making a final selection.

Yes, correct tire fitment still matters when showing a 2017 Buick, even though it is a modern car rather than a prewar or muscle-era vehicle. Judges and knowledgeable enthusiasts will notice obvious departures such as the wrong wheel diameter, an incorrect aspect ratio that changes the car's stance, or a sidewall treatment that does not suit the model's original character. For 2017 Buick models, the important baseline is using the proper metric radial size for the exact model and wheel package.

The closer the event is to factory-authentic presentation, the more those details tend to matter. A Verano wearing the correct 17- or 18-inch size will look more settled and proportionate than one fitted with a substitute chosen only for convenience. Concours-level standards vary by event, so owners pursuing judged competition should confirm the expectations of that specific venue. Even on a late-model collectible, tire size and sidewall appearance can influence the overall impression.

BFGoodrich g-Force Sport COMP-2 and Nitto NT555 G2 overlap in several 2017 Buick sizes, including 235/50R18, 255/35R20, and 225/50R17. In 235/50R18, the BFGoodrich carries a 97W marking with a 6.5 to 8.5-inch rim-width range and a 1,609-pound load figure, while the Nitto appears as an XL 101W with a 6.5 to 8.5-inch fitment range and a 1,819-pound load figure. In 225/50R17, the BFGoodrich is 94W with a 6.0 to 8.0-inch range, while the Nitto is XL 98W with a 6.0 to 8.0-inch range and a 1,653-pound load figure.

Those differences matter when you are trying to match the tire to the way a 2017 Buick is actually used. A buyer comparing the two should look beyond the brand name and review the load index, XL marking where present, and the exact wheel width on the car. Since both are modern Blackwall radial choices, the decision is less about authenticity in the vintage sense and more about selecting the specification set that best aligns with the vehicle's wheel package and intended road use.

Yes, the 2017 Buick tire sizes covered here are modern radial designs with speed ratings appropriate for normal highway use. Most appear with W ratings, which correspond to a 168 mph ceiling, while some 245/40R20, 245/40R19, and 255/35R20 options also appear with Y ratings, which correspond to a 186 mph ceiling. Those ratings far exceed legal U.S. highway speeds, so in ordinary driving the tire's speed symbol is rarely the limiting factor on a roadworthy Buick.

Real safety still depends on condition, age, inflation, alignment, and the state of the car itself. A 2017 Buick with worn suspension parts, poor brakes, or old hardened tires will not benefit just because the sidewall carries a high speed letter. Confirm the exact size, inspect the tire carefully, and use the speed rating as a capacity marker rather than an invitation to drive at the limit. For most owners, fresh rubber and proper setup matter more than the highest possible symbol.

Inflation pressure on a 2017 Buick should follow the vehicle placard or owner's manual first, since the car's recommended setting is tied to its weight distribution and handling balance. Tire ratings also matter. Published maximum load and pressure figures include 1,709 pounds at 50 psi for one 245/40R20 option, 1,609 to 1,819 pounds at 50 to 51 psi in 235/50R18, 1,653 pounds at 50 psi in 245/40R19, 1,609 pounds at 50 psi in 255/35R20, 1,477 to 1,653 pounds at 50 to 51 psi in 225/50R17, and 1,653 pounds at 50 psi in 235/45R18.

Those numbers are not blanket operating pressures for every 2017 Buick. They describe the tire's rated maximum load relationship and should not be transferred casually from one size to another or used in place of Buick's factory recommendations. Start with the vehicle placard, then confirm that the tire you choose meets the needed load capacity for the car. If the wheel package has been changed from stock, verify both the vehicle requirement and the tire maker's guidance before settling on a final pressure.

Before a longer drive in a 2017 Buick, inspect all four tires for cracking, punctures, sidewall bubbles, and uneven wear, then verify cold pressure against the vehicle's recommended setting. Check tread depth across the full width, not just at the center, and make sure the valve stems are in good condition. Since these Buick fitments include multiple wheel diameters and lower-profile options, it is also smart to look closely for rim damage that could affect sealing or ride quality.

The spare deserves the same attention, especially on a Buick that sees occasional rather than daily use. A long drive is also a good reason to look beyond the tires and give the rest of the car a basic mechanical once-over, including brakes, fluids, and battery condition. Tires are only one part of road readiness, but they are the part in direct contact with the pavement. A careful pre-trip check can catch aging or impact damage before it interrupts the drive.