The 2019 Chevrolet Trucks Blazer revived the Blazer name as a sharply styled midsize crossover, blending everyday utility with a more athletic, street-oriented look than many traditional SUVs. Its stance and trim differences make wheel-and-tire fitment a real part of the vehicle’s character, especially on upper trims with larger-diameter wheels. This model uses radial tire sizes 235/65R18, 235/55R20, and 265/45R21, so the first step is matching the tire to the exact sub-model and wheel package. Once that is settled, the decision shifts to maintaining the intended profile, confirming wheel diameter, and choosing a tire that suits the Blazer’s appearance and road-use needs.
Which Tire Size Is Right for The 2019 Chevrolet Trucks Blazer
Three primary tire sizes apply to the 2019 Chevrolet Trucks Blazer, and they vary by sub-model and wheel diameter. That makes the first job identifying the exact trim and confirming whether the vehicle is on 18-inch, 20-inch, or 21-inch wheels. Once that is clear, the real choice becomes selecting the right radial tire within the correct size while preserving proper proportions and clearance.
235/55R20 is a modern metric radial size: 235 is the nominal section width in millimeters, 55 is the aspect ratio, R indicates radial construction, and 20 is the rim diameter in inches. On the 2019 Chevrolet Trucks Blazer, this size supports a lower-profile look than the 18-inch fitment while keeping a similar overall tire height. It appears on certain Base, Premier, and RS configurations, so it is tied to specific wheel packages rather than every Blazer. This size is the right starting point when the vehicle already wears 20-inch wheels and the goal is to stay with the intended stance and profile.
235/65R18 is a modern metric radial size with a 235-millimeter nominal section width, a 65-series aspect ratio, radial construction, and an 18-inch rim diameter. Compared with the larger-wheel Blazer fitments, it uses a taller sidewall while staying close in overall diameter. This size appears on the Blazer L and on certain Base models, so it is associated with specific trims and wheel setups. It is the size to evaluate when the vehicle has 18-inch wheels and you want to keep the original wheel diameter and sidewall relationship intact.
265/45R21 is a modern metric radial size: 265 is the nominal section width in millimeters, 45 is the aspect ratio, R marks radial construction, and 21 is the rim diameter in inches. This is the widest of the three Blazer fitments and it pairs that extra width with a lower-profile sidewall on a 21-inch wheel. It is used on certain Premier and RS models, making trim and wheel confirmation especially important before selection. Buyers looking at this size should focus on preserving the correct wheel diameter and verifying that the current wheel setup matches the intended factory-style fitment.
Tire fitment on the 2019 Chevrolet Trucks Blazer depends on the exact sub-model, and some trims use more than one factory wheel-and-tire combination. Checking the trim level and actual wheel diameter matters before choosing a replacement tire, especially where 18-inch, 20-inch, and 21-inch setups overlap within the same model line.
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2019 Chevrolet Trucks Blazer Base
The 2019 Chevrolet Trucks Blazer Base can use either 235/65R18 or 235/55R20 radial tires, depending on the wheel setup on the vehicle. Tire selection starts with confirming whether the Blazer has 18-inch or 20-inch wheels, then choosing a replacement that maintains the intended profile and clearance.
The 2019 Chevrolet Trucks Blazer L uses the 235/65R18 radial size, making fitment more straightforward than on trims with multiple wheel packages. The main decision is staying with the correct 18-inch tire size and selecting a tire that suits the vehicle’s everyday road use and overall presentation.
The 2019 Chevrolet Trucks Blazer Premier can use either 235/55R20 or 265/45R21 radial tires, depending on the wheel package installed. That makes wheel confirmation essential before ordering, since the two sizes use different rim diameters and present the vehicle with noticeably different sidewall proportions.
The 2019 Chevrolet Trucks Blazer RS uses either 235/55R20 or 265/45R21 radial tires, tied to the specific wheels on the vehicle. Choosing correctly means confirming whether the RS is on 20-inch or 21-inch rims first, then matching the tire size to that setup rather than selecting by trim name alone.
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.
Frequently Asked Questions
Tire questions for the 2019 Chevrolet Trucks Blazer usually come down to exact size, wheel diameter, trim-specific fitment, and how to choose among the correct radial options. The answers below focus on fitment, wheel verification, selection priorities, and practical road-use checks.
Tire Size & Fitment
What tire size fits a 2019 Chevrolet Trucks Blazer?
The 2019 Chevrolet Trucks Blazer uses three primary tire sizes: 235/65R18, 235/55R20, and 265/45R21. All three are radial sizes, and the correct one depends on the exact sub-model and wheel package. The L uses 235/65R18, while Base, Premier, and RS models can vary by wheel setup.
The practical step is to confirm the actual wheel diameter on the vehicle before choosing a replacement tire. An 18-inch tire will not work on a 20-inch or 21-inch wheel, even though the overall tire heights are relatively close. Trim name alone is not always enough, especially on Base, Premier, and RS models with more than one fitment.
What size rim does a 2019 Chevrolet Trucks Blazer use?
A 2019 Chevrolet Trucks Blazer can use 18-inch, 20-inch, or 21-inch rims, depending on the trim and wheel package. The 235/65R18 size mounts on an 18-inch rim, the 235/55R20 size mounts on a 20-inch rim, and the 265/45R21 size mounts on a 21-inch rim.
Rim diameter is the first thing to verify because it determines which tire size family the Blazer can use. Looking only at sidewall width or overall appearance can lead to ordering the wrong size. Checking the tire sidewall and confirming the wheel currently on the vehicle is the safest way to narrow the choice before comparing replacement tires.
Why does the 2019 Chevrolet Trucks Blazer have more than one tire size?
The 2019 Chevrolet Trucks Blazer has more than one tire size because different trims and wheel packages use different factory-style wheel diameters. The model range spans 18-inch, 20-inch, and 21-inch setups, with the L using 235/65R18 and some Base, Premier, and RS models using either 235/55R20 or 265/45R21.
That variation means replacement selection should follow the wheel-and-tire package actually on the vehicle, not the model name alone. Two Blazers from the same year can share the same trim badge but still require different tires. Matching the existing wheel diameter first helps preserve the intended proportions and avoids basic mounting problems.
Choosing the Right Tire
What should I consider when choosing a tire for a 2019 Chevrolet Trucks Blazer?
Start with the correct size for the exact 2019 Chevrolet Trucks Blazer trim and wheel package: 235/65R18, 235/55R20, or 265/45R21. After size is confirmed, compare tires within that same size based on the way the Blazer is used, whether that is regular commuting, seasonal driving, or a preference for a particular ride feel and appearance.
Wheel diameter needs to stay matched to the tire, and any non-stock wheels should be checked carefully before replacement. It also helps to confirm the current setup is uniform at all four corners and that no previous owner changed wheel size. That approach keeps the decision focused on the right tire choices instead of sorting out an avoidable fitment mismatch.
How do I choose between the available 235/55R20 and 265/45R21 tires for a 2019 Chevrolet Trucks Blazer?
The choice between 235/55R20 and 265/45R21 is not a matter of preference alone, because each size is tied to a different wheel diameter. A 2019 Chevrolet Trucks Blazer with 20-inch wheels needs 235/55R20, while one with 21-inch wheels needs 265/45R21. The 21-inch size also carries a wider, lower-profile presentation.
Once the wheel diameter is confirmed, compare tires only within that correct size. It is also wise to inspect the existing wheels for any aftermarket changes that could affect the original setup. Staying with the proper size helps maintain intended proportions and reduces the chance of clearance or mounting issues caused by crossing between two different rim diameters.
How do I choose between the available 2019 Chevrolet Trucks Blazer tire sizes on a Base, Premier, or RS model?
Base, Premier, and RS versions of the 2019 Chevrolet Trucks Blazer can use more than one tire size, so the deciding factor is the wheel package on the vehicle. Base models can use 235/65R18 or 235/55R20, while Premier and RS models can use 235/55R20 or 265/45R21. The correct size follows the wheel diameter already installed.
The most useful check is the size molded into the current tire sidewall, then a visual confirmation of whether the wheel is 18, 20, or 21 inches. That prevents guessing by trim badge alone. Once the correct size is established, selection becomes much simpler because you can compare tires within the right fitment instead of across incompatible wheel diameters.
Restoration & Appearance
Does correct tire fitment matter for a 2019 Chevrolet Trucks Blazer restoration or appearance-focused build?
Yes, correct tire fitment matters because the 2019 Chevrolet Trucks Blazer’s look changes noticeably across its 18-inch, 20-inch, and 21-inch wheel packages. The relationship between sidewall height, wheel diameter, and body stance is part of the vehicle’s overall presentation. Using the proper size helps keep that balance intact.
Appearance-focused owners should confirm whether the vehicle still carries its intended wheel package before replacing tires. A Base, Premier, or RS model may wear a different wheel size than it left with, especially after a previous owner’s changes. Matching the tire to the actual wheel setup preserves the visual proportions rather than relying on trim name alone.
How does tire size affect the appearance of a 2019 Chevrolet Trucks Blazer?
Tire size has a clear effect on the appearance of a 2019 Chevrolet Trucks Blazer because the model uses three different wheel diameters. The 235/65R18 fitment gives a taller-sidewall look, the 235/55R20 balances sidewall and wheel presence, and the 265/45R21 creates the widest and lowest-profile presentation of the group.
That visual difference is why size should follow the wheel package rather than personal preference alone. Swapping sizes across different rim diameters is not a simple styling change, since the tire must match the wheel correctly. Owners focused on a clean, factory-inspired look should verify the existing wheel size first and then stay within the matching tire fitment.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 Chevrolet Trucks Blazer?
Yes, modifications can affect tire fitment on a 2019 Chevrolet Trucks Blazer. Aftermarket wheels, changes in wheel width or offset, suspension lowering, and body alterations can all change how a 235/65R18, 235/55R20, or 265/45R21 tire sits in the wheel opening. Even when the size looks familiar, the setup may no longer match stock geometry.
A modified Blazer should be checked for wheel diameter, wheel width, and clearance at full steering lock before new tires are chosen. Tire size alone does not tell the whole story once the original setup has been changed. Looking at the current wheel-and-suspension combination helps avoid rubbing, mounting problems, or unwanted changes in stance.
What should I inspect before driving a 2019 Chevrolet Trucks Blazer on new tires?
Before driving a 2019 Chevrolet Trucks Blazer on new tires, inspect the wheel condition, verify that all tires match the intended size, and confirm inflation is set correctly for the vehicle’s needs. It also helps to look over valve stems, lug hardware, and tread seating after installation, especially when changing between different wheel packages.
A short follow-up inspection is worthwhile after the first miles on the road. Watch for vibration, steering pull, or any sign of contact in the fender or suspension area. Catching those issues early matters most on Blazers that may have had wheel changes, suspension modifications, or previous repairs that altered the original fitment relationship.
How often should tires on a 2019 Chevrolet Trucks Blazer be inspected?
Tires on a 2019 Chevrolet Trucks Blazer should be inspected regularly, not just when tread wear becomes obvious. Sidewall damage, uneven wear, punctures, and slow air loss can develop before the tire looks badly worn from a distance. A quick visual check and pressure check on a routine basis is a sensible habit.
Longer intervals between inspections can allow alignment or suspension issues to go unnoticed, especially on larger-wheel setups with lower-profile tires. It is smart to inspect before longer drives and after impacts with potholes or curbs. That routine helps protect the correct fitment and can reveal whether the Blazer’s current wheel-and-tire setup is wearing evenly.
