2021 Buick Trucks centered on modern crossover utility, with the Enclave, Encore, Encore GX, and Envision covering everything from compact city-friendly transportation to larger family-oriented luxury hauling. Buick’s lineup for this model year leaned toward comfort, quiet road manners, and upscale everyday use rather than old-school truck styling, which makes tire selection more about matching the right size to the right model than choosing between vintage constructions. Across 2021 Buick Trucks, six radial sizes appear across four models, and none are universal to the full range. Before choosing a tire, the first step is confirming your exact model and whether it uses an 18-inch or 20-inch fitment.
Which Tire Size Is Right for Your 2021 Buick Trucks
2021 Buick Trucks use six tire sizes across four models, and the sizes vary by model rather than carrying across the full range. The key decision here is identifying the correct model and rim diameter first, since these fitments span both 18-inch and 20-inch wheels. Understanding that distinction before choosing a product saves time and helps ensure the right match.
The 255/55R20 is a radial metric size with a 255-millimeter section width, a stated 55-series profile, and a 20-inch rim diameter. This size is specific to the Enclave rather than universal across 2021 Buick Trucks. Buyers with this fitment should confirm they are working with the Enclave’s 20-inch wheel package before moving on to product selection.
The 255/65R18 is a radial metric size with a 255-millimeter section width, a stated 65-series profile, and an 18-inch rim diameter. This size is also Enclave-specific, serving a different wheel package than the model’s 20-inch option. It is the right starting point for Enclave owners who need the taller-sidewall 18-inch fitment rather than the lower-profile 20-inch setup.
The 215/55R18 is a radial metric size with a 215-millimeter section width, a stated 55-series profile, and an 18-inch rim diameter. It is specific to the Encore and does not interchange across the rest of the 2021 Buick Trucks range. Encore owners should treat this as a model-specific fitment and verify the wheel size on the vehicle before choosing a replacement tire.
Year(s): 2021|Fit(s): Encore GX|Construction: Radial|Rim: 18-in
The 225/55R18 is a radial metric size with a 225-millimeter section width, a stated 55-series profile, and an 18-inch rim diameter. This fitment belongs to the Encore GX alone, so it is not a year-wide Buick crossover size even though it shares the same rim diameter as several other applications. Buyers should confirm they have an Encore GX and not a standard Encore before selecting tires in this size.
Year(s): 2021|Fit(s): Envision|Construction: Radial|Rim: 20 in
The 245/45R20 is a radial metric size with a 245-millimeter section width, a stated 45-series profile, and a 20-inch rim diameter. BFGoodrich and Nitto offer this size in blackwall radial form, and speed ratings vary by product, including W-rated fitments to 168 mph and Y-rated fitments to 186 mph. This size is specific to the Envision’s 20-inch application and suits owners who want to stay with the sharper-profile factory wheel package.
The 235/60R18 is a radial metric size with a 235-millimeter section width, a stated 60-series profile, and an 18-inch rim diameter. It is specific to the Envision and represents that model’s alternate wheel package rather than a shared Buick fitment across the year. Envision owners should confirm whether their vehicle carries the 18-inch or 20-inch wheel before narrowing the product search.
Four Buick crossover models are covered for the 2021 model year. Tire size varies by model, and in the case of the Enclave and Envision, it also varies by wheel package, so year and make alone are not enough to choose correctly. Select your model below to narrow the fitment history and tire options to the exact Buick application you own.
2021 Buick Trucks Enclave
The 2021 Buick Enclave was Buick’s larger three-row crossover, aimed at buyers who wanted family space with a more premium character than a mainstream utility vehicle. Enclave fitments mount on either 18-inch or 20-inch wheels, so wheel package identification matters before choosing a tire.
The 2021 Buick Encore served as Buick’s smaller urban-focused crossover, known for compact dimensions and easy everyday maneuverability. Its tire fitment mounts on an 18-inch wheel, making it distinct from the Encore GX despite the similar name.
The 2021 Buick Encore GX was positioned as a roomier and more contemporary companion to the standard Encore, with its own body, proportions, and fitment needs. It uses an 18-inch wheel fitment, but the tire size differs from the regular Encore and should not be assumed interchangeable.
The 2021 Buick Envision occupied Buick’s compact-to-midsize premium crossover space and carried a more athletic stance than the larger Enclave. Envision fitments mount on either 18-inch or 20-inch wheels depending on configuration, so checking the actual wheel is the key first step.
Four products are available across one tire size for 2021 Buick Trucks vehicles. The 245/45R20 Envision fitment includes four radial blackwall choices from BFGoodrich and Nitto. Confirm your exact size before selecting, since the 2021 Buick range uses multiple model-specific fitments and speed ratings can vary within a size.
These FAQs cover how 2021 Buick Trucks tire sizes differ by model, what the metric size codes mean, how the available 245/45R20 products compare, and what to check for storage, highway use, and longer drives.
Size Basics & Fitment
What tire sizes fit 2021 Buick Trucks vehicles?
2021 Buick Trucks use six sizes across four models: Enclave uses 255/55R20 and 255/65R18, Encore uses 215/55R18, Encore GX uses 225/55R18, and Envision uses 245/45R20 and 235/60R18. The rim diameters span 18-inch and 20-inch applications, and the available 245/45R20 products fit 20-inch rims with a 7.5- to 9.0-inch rim-width range.
That means year and make alone are not enough to choose a tire for a 2021 Buick Trucks vehicle. Start by identifying the exact model, then confirm whether the vehicle carries the 18-inch or 20-inch wheel package. Once those two points are settled, the size choice becomes much more straightforward and avoids confusion between similarly named Buick crossovers.
What does 245/45R20 mean on a 2021 Buick Trucks tire?
On a 2021 Buick Trucks tire, 245/45R20 is a metric radial size. The 245 is the section width in millimeters, 45 is the aspect ratio, the R indicates radial construction, and 20 is the wheel diameter in inches. Within the 2021 Buick Trucks range, this size belongs to the Envision’s 20-inch application.
That decoding matters because it separates wheel diameter from tire width and profile. A 245/45R20 tire cannot be substituted for an 18-inch Envision fitment or for another Buick crossover size simply because the vehicle is from the same year and make. Matching all parts of the size code is the best way to stay aligned with the original wheel package.
Do all 2021 Buick Trucks models use the same tire size?
No, 2021 Buick Trucks models do not share one common tire size. The Encore, Encore GX, Enclave, and Envision each use their own fitments, and both the Enclave and Envision carry two sizes depending on wheel package. Every size in this year-and-make range is tied to a specific model rather than being universal across the lineup.
That has a practical effect for owners comparing crossover models or replacing tires on a newly purchased used Buick. A standard Encore and an Encore GX may look close on paper, but they use different sizes. Checking the door placard, the existing sidewall, or the actual wheel diameter is the quickest way to avoid ordering the right tire for the wrong Buick.
Buying the Right Tire
What sidewall styles are available for 2021 Buick Trucks tires?
For 2021 Buick Trucks, the currently covered 245/45R20 Envision products are blackwall radials. That sidewall appearance suits the modern crossover character of the 2021 Buick lineup and aligns with the understated, contemporary look most owners expect from late-model OEM-style tire fitments.
Sidewall style matters more to overall appearance than to raw fitment, especially on a neo-classic vehicle like a 2021 Buick rather than a whitewall-era collector car. If visual authenticity or a clean factory-type presentation is important, the sidewall treatment should be confirmed alongside the size, because two tires with the same dimensions can still present a different finished look on the vehicle.
What brands make tires for 2021 Buick Trucks vehicles?
For the 2021 Buick Trucks fitments currently covered in products, the 245/45R20 Envision size is available from BFGoodrich and Nitto. BFGoodrich appears in several performance-oriented radial choices in that size, while Nitto is also represented with a blackwall radial option for the same 20-inch application.
Brand choice is easiest to evaluate after the correct size is settled, because Buick’s 2021 crossover range does not share one common year-wide fitment. Once you know the vehicle is an Envision with 245/45R20 tires, you can compare brand character, speed rating, and construction details within that size rather than trying to compare products that belong to a different Buick model.
What is the difference between BFGoodrich and Nitto options for the 2021 Buick Trucks 245/45R20 size?
Within the 2021 Buick Trucks 245/45R20 size, BFGoodrich appears in multiple blackwall radial products, including W- and Y-rated versions, and those BFGoodrich fitments carry a 20-inch rim diameter with a 7.5- to 9.0-inch rim-width range. Nitto also offers a blackwall radial in the same size, with a W speed rating and a published weight of 30.38 pounds.
The useful comparison is not whether one brand is universally right, but whether the exact product’s speed rating, wheel-width compatibility, and general driving character match your Envision’s use. If you are comparing two 245/45R20 tires side by side, look at the full sidewall code and the wheel-width recommendation first, then decide which product best fits the vehicle’s intended road use.
Fitting & Setup
What rim width do 2021 Buick Trucks tires require?
Rim-width guidance is available for the 2021 Buick Trucks 245/45R20 Envision fitment, where the covered products call for a 20-inch rim and a 7.5- to 9.0-inch wheel width. That range applies to the specific 245/45R20 products in hand rather than automatically carrying across every other 2021 Buick Trucks size.
Wheel diameter and wheel width both matter, but they do different jobs. A tire can have the correct 20-inch bead seat and still be mismatched to a wheel that falls outside its approved width range. Before mounting a replacement on a 2021 Buick Trucks vehicle, confirm the actual wheel width so the tire profile and bead seating remain within the manufacturer’s intended window.
Do 2021 Buick Trucks tires require inner tubes?
The covered 2021 Buick Trucks 245/45R20 products are modern radial tires and do not show tube-type markings in their size designations. One BFGoodrich product carries a TL marking, which identifies it as tubeless, and the rest of the available 245/45R20 products follow modern tubeless radial practice for late-model crossover applications.
For a 2021 Buick Trucks vehicle, tube fitment is usually less about vintage wheel design and more about matching the tire to the wheel and valve hardware already on the vehicle. Even so, it is smart to inspect the wheel condition and valve stems during installation. A tubeless tire still depends on a clean bead seat and healthy valve components to hold pressure properly.
Maintenance, Storage & Longevity
How should I store a 2021 Buick Trucks when the tires are fitted?
A 2021 Buick Trucks vehicle should be stored in a cool, dry place away from direct sunlight, electric motors, welders, furnaces, and other ozone-producing equipment that can accelerate sidewall aging. Keeping the tires properly inflated, moving the vehicle periodically, and avoiding long-term parking on damp ground all help protect the radial tires from flat-spotting and environmental degradation.
For seasonal or low-mileage use, storage habits often influence tire condition more than tread wear. If the vehicle will sit for an extended period, clean the tires, keep them out of standing water, and consider reducing prolonged load on one contact patch by rolling the vehicle occasionally. That approach helps preserve ride quality and keeps the tire casing healthier over time.
How long do tires on a 2021 Buick Trucks typically last?
Tire life on a 2021 Buick Trucks vehicle is usually judged by age, condition, and service history rather than mileage alone. A good rule is to begin evaluating tires closely around five to seven years of age and to give serious replacement consideration as they approach roughly ten years, even if tread depth still appears usable. The DOT date code on the sidewall is the starting point for that timeline.
That matters especially for lower-mileage crossovers that may look fine at a glance but spend long periods parked. Rubber hardens with time, and age-related cracking or loss of flexibility can appear before the tread is worn out. If a 2021 Buick Trucks vehicle is driven infrequently, routine age checks are just as important as checking the remaining tread depth.
How often should tires on a 2021 Buick Trucks be inspected?
Tires on a 2021 Buick Trucks vehicle should be inspected before every drive and again before any longer highway outing. The inspection should include air pressure, visible sidewall cracking, cuts, bulges, punctures, uneven wear, and any sign that the tire is losing air. On a modern tubeless setup, valve stem condition and bead sealing are also worth checking.
Short local trips can hide issues that become much more serious at sustained speed and heat. A quick walkaround takes very little time and can catch a problem before it strands the vehicle or damages the wheel. If one tire shows wear or aging that differs from the rest, it is worth investigating alignment, suspension, or prior repair history before continuing regular use.
Safety & Road Use
Are 2021 Buick Trucks tires safe for highway driving?
2021 Buick Trucks use modern radial tire sizes, and the covered 245/45R20 Envision products carry W and Y speed ratings. W-rated tires are rated to 168 mph, while Y-rated tires are rated to 186 mph. Those figures are far beyond normal legal highway speeds, so for everyday driving the more important issue is using the correct size, maintaining proper inflation, and making sure the tire is in sound condition.
A late-model Buick crossover is generally engineered around modern road use, but highway safety still depends on the whole vehicle rather than the speed symbol alone. Suspension condition, brake performance, alignment, and load all affect real-world stability. Treat the speed rating as part of the tire’s capability envelope, then pair it with sensible inspection and maintenance before regular highway use.
What inflation pressure should I use for 2021 Buick Trucks tires?
Inflation pressure for a 2021 Buick Trucks tire should follow the vehicle manufacturer’s placard or owner’s manual for the exact model and wheel package first, then be checked against the tire maker’s sidewall information where appropriate. In the covered 245/45R20 products, maximum load and pressure examples include 1,930 pounds at 50 psi and 1,929 pounds at 50 psi on specific BFGoodrich fitments.
Those maximum figures are not a universal everyday setting for every 2021 Buick Trucks model or even for every tire in the same size. They describe the tire’s rated limit under specified conditions. Use the Buick factory recommendation for normal service, and avoid transferring a pressure figure from an Envision 245/45R20 tire to another model or another size without confirming the proper application.
What should I check before taking a 2021 Buick Trucks on a longer drive?
Before taking a 2021 Buick Trucks vehicle on a longer drive, inspect each tire for sidewall cracking, cuts, bulges, punctures, uneven tread wear, and proper inflation. Check that the valve stems are in good condition, confirm the spare is usable if one is present, and make sure no tire is older than you are comfortable trusting for sustained highway travel.
A longer drive also puts more heat into the tire than local errands do, which can expose weaknesses that stayed hidden around town. Once the tires pass inspection, give the rest of the vehicle the same level of attention with a quick look at brakes, fluids, lights, and suspension feel. On a modern Buick crossover, tire readiness is one part of overall trip readiness.
