The 2020 Subaru Trucks Ascent sits in the modern three-row family crossover segment, built for buyers who need passenger space, all-weather confidence, and everyday road manners in one package. That makes tire fitment more than a cosmetic choice, because the Ascent’s wheel package affects both ride character and replacement selection. This model uses radial tires in either 245/60R18 or 245/50R20, depending on the specific sub-model and wheel setup. The main decision is confirming which rim diameter your Ascent has before comparing tire options in the correct size. Once that is settled, the focus shifts to matching the tire to the vehicle’s trim, appearance, and intended road use.
Which Tire Size Is Right for The 2020 Subaru Trucks Ascent
Two primary tire sizes apply to the 2020 Subaru Trucks Ascent, and the difference comes down to sub-model and wheel diameter. Some versions use 245/60R18 on an 18-inch rim, while others use 245/50R20 on a 20-inch rim. The first thing to confirm is the exact sub-model and wheel size on the vehicle, especially if it has changed hands or received replacement wheels.
245/60R18 is a metric radial size where 245 refers to section width in millimeters, 60 is the aspect ratio, R identifies radial construction, and 18 is the rim diameter in inches. On the 2020 Subaru Trucks Ascent, this is one of the primary modern fitments and is used on 18-inch wheel applications. Because it is a current metric radial format, replacement shopping is usually centered on confirming the correct wheel package rather than decoding a vintage size system. This size is the right place to start when the vehicle has the factory-style 18-inch wheel setup or a matching replacement rim.
245/50R20 is also a metric radial size, with a 245-millimeter section width, a 50-series aspect ratio, radial construction, and a 20-inch rim diameter. For the 2020 Subaru Trucks Ascent, this size belongs to 20-inch wheel applications and serves a different fitment path than the 18-inch setup. Its meaning is straightforward, but the practical issue is making sure the vehicle actually carries the 20-inch wheel package before selecting a tire. Buyers replacing a single tire or a full set should verify the rim diameter on the vehicle rather than assuming all Ascent trims use the same size.
Tire fitment for the 2020 Subaru Trucks Ascent varies by sub-model, so trim identification matters before choosing a replacement. The biggest distinction is wheel diameter, since this Ascent range uses both 18-inch and 20-inch tire packages.
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2020 Subaru Trucks Ascent Base
The 2020 Subaru Trucks Ascent Base uses the 245/60R18 radial size on an 18-inch wheel package. That keeps tire selection focused on the correct modern metric size rather than sorting through multiple primary fitments for this trim.
The 2020 Subaru Trucks Ascent Limited uses 245/50R20 radial tires, tying this trim to a 20-inch wheel setup. Replacement selection starts with confirming that rim diameter, then choosing a tire in the same metric radial size.
The 2020 Subaru Trucks Ascent Premium can use either 245/50R20 or 245/60R18 radial tires, depending on the wheel package installed on the vehicle. That makes wheel confirmation especially important before purchase, since size choice here depends on the actual rim diameter rather than the trim name alone.
The 2020 Subaru Trucks Ascent Touring uses the 245/50R20 radial size with a 20-inch wheel. For this trim, the key step is staying with the correct metric radial size and verifying that the current wheels have not been changed from the original diameter.
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
These FAQs focus on the exact tire sizes used on the 2020 Subaru Trucks Ascent, how trim level affects fitment, and what to check on the wheels, tires, and vehicle before regular road use.
Tire Size & Fitment
What tire size fits a 2020 Subaru Trucks Ascent?
The 2020 Subaru Trucks Ascent uses either 245/60R18 or 245/50R20, depending on sub-model and wheel package. Both are radial metric sizes, but they fit different rim diameters, so they are not the same replacement choice. Base models use 245/60R18, Limited and Touring use 245/50R20, and Premium may use either size.
The practical step is to confirm the exact wheel diameter on the vehicle before ordering tires. A trim badge helps, but the safest check is the tire sidewall and wheel itself, especially if the Ascent has had replacement wheels or a previous owner changed the setup.
What size rim does a 2020 Subaru Trucks Ascent use?
A 2020 Subaru Trucks Ascent uses either an 18-inch or 20-inch rim, depending on the tire size installed. The 245/60R18 tire fits an 18-inch rim, while the 245/50R20 tire fits a 20-inch rim. The model line does not use one universal rim diameter across every sub-model.
That makes rim confirmation the first fitment check before replacing tires. Looking at the existing tire size on the sidewall is usually the quickest way to verify it, and it is especially important on Premium models, which can be equipped with either of the two factory tire sizes.
Why does the 2020 Subaru Trucks Ascent have more than one tire size?
The 2020 Subaru Trucks Ascent has more than one tire size because different sub-models use different wheel packages. One setup uses 245/60R18 on an 18-inch rim, while another uses 245/50R20 on a 20-inch rim. The Premium trim can appear with either size, which adds another layer to replacement selection.
This means tire choice starts with identifying the exact wheel package on your vehicle, not just the model name. Two Ascents from the same year can require different tires, so checking the current sidewall marking and wheel diameter helps prevent ordering the wrong size.
Choosing the Right Tire
What should I consider when choosing a 245/60R18 tire for a 2020 Subaru Trucks Ascent?
For a 2020 Subaru Trucks Ascent that uses 245/60R18, the main consideration is staying with the correct 18-inch metric radial size. This size is used on the Base trim and on some Premium models, so the tire needs to match that wheel diameter first. Size accuracy matters more than trim assumptions.
After confirming fitment, compare the tire’s intended road use, seasonal priorities, and ride expectations. It also helps to inspect the existing wheel for width and condition, and to make sure the vehicle has not been changed to a different wheel package before replacing one tire or a full set.
What should I consider when choosing a 245/50R20 tire for a 2020 Subaru Trucks Ascent?
A 2020 Subaru Trucks Ascent using 245/50R20 needs a tire built for a 20-inch rim and the same modern metric radial sizing format. This size is used on Limited and Touring models, and it can also appear on Premium trims. Getting the wheel diameter right is the first and most important step.
Once size is confirmed, compare tires by how the vehicle is used, whether that means daily commuting, highway travel, or year-round family driving. It is also smart to check tread wear patterns, alignment condition, and whether all four tires should be replaced together for balanced road behavior.
How do I choose between the available tires for a 2020 Subaru Trucks Ascent?
Choosing between tires for a 2020 Subaru Trucks Ascent starts with the correct primary size, either 245/60R18 or 245/50R20. From there, the decision becomes one of use case rather than basic fitment. A family hauler driven in mixed weather may call for a different tread approach than one used mostly for highway miles.
It helps to look at how the Ascent is actually driven, then compare tires that suit that pattern while staying within the proper size. Checking wheel condition, current wear, and whether the vehicle still has its original wheel package can prevent mismatched replacements and unnecessary fitment problems.
Restoration & Appearance
Does correct tire fitment matter for a 2020 Subaru Trucks Ascent restoration?
Correct tire fitment still matters on a 2020 Subaru Trucks Ascent, even though this is a modern vehicle rather than a vintage restoration project. The right size preserves the intended relationship between tire, wheel, and body, and it keeps the vehicle visually consistent with its proper trim-level wheel package.
Appearance issues usually begin when an 18-inch setup is mistaken for a 20-inch setup, or the reverse. Anyone trying to return the vehicle to a more original-looking presentation should verify the sub-model and existing wheel diameter first, then match the tire size to that configuration.
How does tire size affect the appearance of a 2020 Subaru Trucks Ascent?
Tire size affects the appearance of a 2020 Subaru Trucks Ascent because the vehicle uses two different wheel diameters, and each creates a different visual balance between tire sidewall and wheel face. A 245/60R18 presents more sidewall, while a 245/50R20 is tied to a larger wheel and shorter sidewall profile.
That does not make one setup more correct than the other across the whole model line; it simply means appearance should match the trim and wheel package actually on the vehicle. Keeping the proper size for the installed rim avoids a look that seems mismatched or out of proportion.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2020 Subaru Trucks Ascent?
Modifications can affect tire fitment on a 2020 Subaru Trucks Ascent, especially when they involve aftermarket wheels, suspension changes, or altered ride height. The factory fitments are 245/60R18 and 245/50R20, each tied to a specific rim diameter. Changing the wheel package can alter what size the vehicle can physically accept.
That is why it is important to inspect the actual setup on the vehicle instead of relying only on model year and trim. Clearance at the fenders and steering components, along with wheel width and overall condition, should be checked whenever the Ascent no longer wears its original-style wheel arrangement.
What should I inspect before driving a 2020 Subaru Trucks Ascent on new tires?
Before driving a 2020 Subaru Trucks Ascent on new tires, inspect the wheel diameter, confirm the installed size matches the vehicle’s setup, and check that the tires are mounted evenly and inflated properly. It is also wise to look over the wheels for damage and make sure the lug hardware is in good condition.
A short road check should follow, paying attention to vibration, pull, or rubbing that could point to a mounting or fitment issue. Looking at alignment wear on the old tires can also be helpful, since uneven wear often signals a chassis or suspension condition that new tires alone will not correct.
How often should tires on a 2020 Subaru Trucks Ascent be inspected?
Tires on a 2020 Subaru Trucks Ascent should be inspected regularly, not just when tread appears low. A quick visual check every month and before longer trips helps catch problems early, including cuts, bulges, cracking, embedded debris, and uneven wear. Pressure loss should also be addressed as soon as it appears.
Regular inspections matter even more if the vehicle sees mixed road conditions or spends time parked between trips. Watching for changes in wear pattern and air pressure can reveal alignment, wheel, or suspension issues before they become more serious, and it helps protect the correct 18-inch or 20-inch fitment already in place.
