The 2015 Buick LaCrosse sits in the modern full-size sedan space with the quiet, upscale character that defined Buick’s later front-drive touring cars. It blends everyday comfort with a more tailored look than many mainstream sedans of its era, which makes correct tire fitment especially important to both ride quality and stance. Tire choice on the 2015 Buick LaCrosse centers on four radial sizes, from 225/55R17 through 245/40R20, with fitment varying by sub-model and wheel package. Available choices also range from blackwall performance-oriented radials to redline, raised white letter, and wide whitewall styles. The key is matching the exact sub-model and wheel diameter before comparing appearance, series, and road-use priorities.
Which Tire Size Is Right for The 2015 Buick LaCrosse
The 2015 Buick LaCrosse uses four primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. All of these are radial fitments, but they span 17-inch through 20-inch rims, so the first step is confirming the car’s current wheel size and then matching that to the specific trim and engine combination before comparing tire style or series.
225/55R17 is a metric radial size in which 225 is the section width in millimeters, 55 is the aspect ratio, R identifies radial construction, and 17 is the wheel diameter in inches. On the 2015 Buick LaCrosse, this size belongs to certain 17-inch wheel applications and keeps the fitment decision in the modern radial category rather than a vintage-style construction choice. Product selection includes blackwall, wide whitewall, and redline treatments from BFGoodrich across series such as g-Force and Silvertown Radial. This size is worth confirming carefully if the car uses the smaller-diameter wheel package or if appearance matters as much as everyday road use.
Fit(s): 2.4L, 3.6L, Leather 2.4L, Leather 3.6L, and Premium
Construction: Radial|Rim: 18 in
235/50R18 is a metric radial size with a 235-millimeter nominal section width, a 50-series profile, radial construction, and an 18-inch rim diameter. For the 2015 Buick LaCrosse, it is a key fitment used across several sub-models, making it one of the most common sizes to verify on this year and model. Available choices include blackwall, redline, and raised white letter options from BFGoodrich, Nitto, and Pro-Trac in series such as g-Force, Nitto NT555 G2, and Street Pro III. It is the size to evaluate when the car carries an 18-inch wheel and the goal is balancing correct fitment with either a standard or more distinctive sidewall presentation.
Fit(s): Leather 3.6L, Leather 3.6L (AWD), and Premium
Construction: Radial|Rim: 19 in
245/45R19 uses a 245-millimeter nominal section width, a 45-series aspect ratio, radial construction, and a 19-inch rim diameter. On the 2015 Buick LaCrosse, this size applies to specific upper-trim and AWD-related fitments, so it should be tied to the exact sub-model rather than assumed across the whole range. Available tires in this size focus on blackwall performance-style offerings from BFGoodrich and Nitto, including g-Force and NT555 G2 series options. This size deserves close attention if the car already wears 19-inch wheels, since wheel diameter and trim-specific setup matter more here than cosmetic sidewall variation.
245/40R20 is a metric radial size where 245 gives the nominal width in millimeters, 40 is the aspect ratio, R marks radial construction, and 20 identifies the wheel diameter. For the 2015 Buick LaCrosse, this is the largest wheel-and-tire fitment in the range and belongs only to certain Premium applications with 20-inch wheels. Product options include blackwall, redline, and raised white letter choices from BFGoodrich, Nitto, and Pro-Trac, with series such as g-Force, NT555 G2, and Street Pro III. This size should be chosen only after confirming the car’s actual 20-inch wheel setup, especially on vehicles that may have had wheel changes over time.
Sub-model fitment on the 2015 Buick LaCrosse is not one-size-fits-all, because tire selection changes with engine, trim, AWD status, and wheel package. Checking the exact sub-model matters before choosing a tire, especially since this range spans four radial sizes and four different rim diameters.
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2015 Buick LaCrosse 2.4L
The 2015 Buick LaCrosse 2.4L uses either a 225/55R17 or 235/50R18 radial fitment, so wheel diameter needs to be confirmed before narrowing the tire search. Once the wheel size is settled, the decision shifts to choosing among available blackwall or styling-oriented sidewall options within the correct modern radial size.
The 2015 Buick LaCrosse 3.6L uses a 235/50R18 radial tire, which makes fitment more straightforward than some other trims. That lets the selection process focus more on tire series, brand, and sidewall presentation rather than sorting through multiple wheel diameters.
The 2015 Buick LaCrosse Leather 2.4L can use either 225/55R17 or 235/50R18, so the actual wheel package on the car should be verified first. After that, the main choice becomes whether to stay with a standard blackwall look or consider a more customized radial appearance such as whitewall or redline where available.
The 2015 Buick LaCrosse Leather 3.6L uses either 235/50R18 or 245/45R19 radial tires depending on the wheel setup. That makes wheel diameter the first checkpoint, followed by a comparison of available series and the more performance-oriented blackwall offerings found in the larger fitment.
The 2015 Buick LaCrosse Leather 3.6L (AWD) uses the 245/45R19 radial size, keeping fitment centered on a 19-inch wheel. Tire choice here is less about sidewall variety and more about confirming the correct wheel setup and comparing the available blackwall radial series in this size.
The 2015 Buick LaCrosse Premium has the widest fitment spread in the range, with 235/50R18, 245/45R19, and 245/40R20 radial options. Exact wheel diameter comes first, and then tire selection can move toward either a conventional blackwall look or the redline and raised white letter styles available in some sizes.
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 2015 Buick LaCrosse Tires for Sale
Available 2015 Buick LaCrosse tires span 17-, 18-, 19-, and 20-inch radial sizes from BFGoodrich, Nitto, and Pro-Trac. Depending on size, the product grid includes blackwall, redline, raised white letter, and wide whitewall options across series such as g-Force, Silvertown Radial, NT555 G2, and Street Pro III.
Common 2015 Buick LaCrosse tire questions usually come down to exact size by sub-model, wheel diameter, sidewall style, and how to compare the available radial tire series. It also helps to know what to inspect if the car has had wheel changes or has spent long periods in light-use service.
Tire Size & Fitment
What tire size fits a 2015 Buick LaCrosse?
The 2015 Buick LaCrosse uses four primary tire sizes: 225/55R17, 235/50R18, 245/45R19, and 245/40R20. All are radial sizes, but they do not apply across the entire model line in the same way, since fitment changes by sub-model and wheel package.
The most important step is confirming the exact sub-model and the actual wheel diameter on the car before choosing a tire. A LaCrosse with 17-inch wheels needs a different fitment path than one with 19- or 20-inch wheels, and previous owner wheel changes can make a quick visual check worthwhile.
What size rim does a 2015 Buick LaCrosse use?
A 2015 Buick LaCrosse can use 17-inch, 18-inch, 19-inch, or 20-inch rims depending on the specific sub-model and wheel setup. Those rim diameters correspond to the four primary tire sizes used on this model year, all in radial construction.
Wheel diameter should be verified before anything else, because tire size selection starts there. Once the rim size is confirmed, it becomes much easier to narrow the correct tire and compare the available series, sidewall treatments, and rim-width specifications that matter within that single fitment.
Why does the 2015 Buick LaCrosse have more than one tire size?
The 2015 Buick LaCrosse has more than one tire size because different trims, engines, AWD status, and wheel packages use different wheel diameters. That is why the range runs from 225/55R17 up to 245/40R20 instead of relying on one size across every version.
This matters because choosing by model name alone can lead to the wrong tire. The better approach is to match the exact sub-model first, then confirm the wheel diameter currently on the car, especially if it may have been fitted with optional or aftermarket wheels at some point.
Choosing the Right Tire
What should I consider when choosing a 2015 Buick LaCrosse tire?
Start with the correct tire size for the exact 2015 Buick LaCrosse sub-model and wheel diameter, since this car uses four different radial fitments. After size is settled, compare construction details within the radial category, sidewall style, tire series, and any rim-width or load figures that apply to the products under consideration.
The right choice depends on how the car is used and how you want it to look. A standard blackwall suits a contemporary appearance, while redline, raised white letter, or wide whitewall versions can shift the visual character, but they still need to match the wheel and fitment requirements already established.
What sidewall styles are available for 2015 Buick LaCrosse tires?
Sidewall choices for the 2015 Buick LaCrosse include blackwall, redline, raised white letter, and wide whitewall, depending on the tire size. Blackwall appears across all four sizes, while the more appearance-focused options are concentrated in selected 17-, 18-, and 20-inch fitments.
That means sidewall style is part of the selection process only after the correct size is confirmed. A buyer looking for a more custom or nostalgic presentation should first verify whether the car uses the size that actually offers those treatments, rather than assuming every LaCrosse fitment has the same appearance options.
What brands offer tires for the 2015 Buick LaCrosse?
BFGoodrich, Nitto, and Pro-Trac all offer tires for the 2015 Buick LaCrosse across the applicable sizes. BFGoodrich appears most broadly throughout the range, while Nitto and Pro-Trac are available in selected 18-, 19-, and 20-inch fitments.
Brand choice should still come after confirming the right size and wheel diameter. Once fitment is correct, compare each brand by the tire series offered in that size, the sidewall treatment available, and any product details such as rim-width range or load capacity that may matter for the car’s setup.
Restoration & Appearance
Which tire should I choose for a period-style 2015 Buick LaCrosse?
A period-style 2015 Buick LaCrosse tire choice usually starts with the correct factory-era size for the exact sub-model, then moves to sidewall presentation. Blackwall keeps the car closest to a typical modern sedan appearance, while wide whitewall or redline options in certain sizes create a more customized, heritage-inspired look.
Appearance should never override fitment. The best approach is to confirm the wheel diameter first, then see whether that size supports the look you want, since not every LaCrosse fitment offers the same sidewall choices. For exact originality questions, marque-specific photos and trim-level references are worth checking.
How does tire construction affect the appearance of a restored 2015 Buick LaCrosse?
On the 2015 Buick LaCrosse, construction does not create a bias-ply-versus-radial appearance decision because the primary fitments are radial. The visual differences come more from sidewall style and tire series, especially when comparing blackwall products with redline, raised white letter, or wide whitewall alternatives.
That makes the selection process more about presentation than construction type. A restoration-oriented owner can keep the correct radial format while still changing the personality of the car, but the tire must remain matched to the proper wheel diameter and sub-model-specific size before appearance choices enter the conversation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 Buick LaCrosse?
Yes, modifications can affect tire fitment on a 2015 Buick LaCrosse, especially if the car has aftermarket wheels, altered suspension height, or changes in wheel width. Since this model already spans 17-inch through 20-inch fitments, even small setup changes can influence which tire size remains appropriate.
A modified car should be checked for actual wheel diameter, wheel width, and clearance at the fender and steering range before a new set is chosen. That is particularly important on the 245/45R19 and 245/40R20 applications, where staying close to the intended wheel-and-tire combination helps avoid selection mistakes.
What should I inspect before driving a 2015 Buick LaCrosse on new tires?
Before driving a 2015 Buick LaCrosse on new tires, inspect the wheel condition, confirm the tire size matches the car’s wheel diameter, and check inflation, tread seating, and visible clearance around the suspension and fenders. It is also smart to make sure all four tires match the intended setup for the specific sub-model.
A short, careful road test can help reveal rubbing, vibration, or pull that might not be obvious in the garage. Cars that have sat for extended periods also deserve a quick check of alignment condition, old wheel damage, and valve stem condition so the new tires start service on a sound foundation.
How often should tires on a 2015 Buick LaCrosse be inspected?
Tires on a 2015 Buick LaCrosse should be inspected regularly, not just at replacement time. A routine check for pressure loss, uneven wear, cracking, bulges, cuts, and tread condition helps catch problems early, especially on a car that may alternate between daily use and longer parked intervals.
Inspection is also a good time to confirm the car still wears the wheel and tire combination you expect. That matters on a model with several valid rim diameters, because a used LaCrosse may no longer have its original wheel package, and that can change the correct replacement path at the next tire purchase.
