The 2018 Subaru Outback sits in the modern crossover wagon space where everyday road comfort, light-trail ability, and year-round usability all matter to the owner. It is a vehicle often chosen for long highway miles, changing weather, and practical versatility rather than a purely cosmetic restoration agenda. Tire fitment centers on two radial sizes, 225/65R17 and 225/60R18, with the correct choice tied to the specific Outback sub-model and wheel diameter. That makes the real decision less about vintage construction and more about confirming the exact trim, understanding the sizing format, and selecting a tire that suits the vehicle's road use and wheel setup.
Which Tire Size Is Right for The 2018 Subaru Outback
The 2018 Subaru Outback uses two primary tire sizes, and the correct one depends on the specific sub-model and its wheel diameter. Some trims use a 17-inch wheel with 225/65R17 tires, while others use an 18-inch wheel with 225/60R18 tires. Before choosing a tire, the first step is confirming the exact Outback trim and verifying whether the vehicle is still on its original wheel size.
Fit(s): 2.5i Limited, 2.5i Touring, 3.6R Limited, and 3.6R Touring
Construction: Radial|Rim: 18 in
225/60R18 is a metric radial size where 225 indicates nominal section width in millimeters, 60 indicates the aspect ratio, R means radial construction, and 18 identifies the wheel diameter in inches. On the 2018 Subaru Outback, this size applies to trims equipped with 18-inch wheels, so it is tied directly to wheel diameter rather than being an interchangeable alternative to the 17-inch fitment. The sizing keeps the same basic width as 225/65R17 while pairing it with a different wheel and profile combination. This is the size to focus on when the vehicle is one of the 18-inch-wheel trims or when the wheel setup has already been confirmed.
Sub-model fitment matters on the 2018 Subaru Outback because tire size changes with trim level and wheel diameter. Some trims use 17-inch-wheel fitment while others move to an 18-inch-wheel setup, so identifying the exact sub-model is the first step before comparing tires.
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2018 Subaru Outback 2.5i
The 2018 Subaru Outback 2.5i uses the 225/65R17 radial size. Tire selection here starts with confirming that the vehicle still has its 17-inch wheels, then comparing options that match the way the Outback is actually driven.
The 2018 Subaru Outback 2.5i Limited uses the 225/60R18 radial size. That makes wheel-diameter confirmation especially important before purchase, since an 18-inch fitment requires a different tire than the 17-inch trims.
The 2018 Subaru Outback 2.5i Premium uses the 225/65R17 radial size. Buyers with this trim should stay focused on the 17-inch-wheel fitment and then narrow the choice by intended road use, tread style, and wheel compatibility.
The 2018 Subaru Outback 2.5i Touring uses the 225/60R18 radial size. Tire choice for this trim begins with the 18-inch wheel setup, making it important to avoid assuming that a lower-trim Outback uses the same fitment.
The 2018 Subaru Outback 3.6R Limited uses the 225/60R18 radial size. Owners should confirm that the vehicle remains on 18-inch wheels and then compare tires based on use, appearance, and any wheel-width requirements tied to the selected product.
The 2018 Subaru Outback 3.6R Touring uses the 225/60R18 radial size. This trim's tire decision is centered on the 18-inch wheel fitment first, then on choosing a tire that matches how the vehicle is used on pavement or mixed surfaces.
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 2018 Subaru Outback Tires for Sale
Current product choices for the 2018 Subaru Outback center on 225/65R17, with a BFGoodrich All-Terrain T/A KO2 radial available in an RBL sidewall style. That gives 17-inch-wheel Outback owners a product to compare by tread character, load specification, and rim-width compatibility.
These FAQs focus on 2018 Subaru Outback tire size by trim, 17-inch versus 18-inch wheel fitment, available product choices, and the inspection steps that matter before regular driving or longer trips.
Tire Size & Fitment
What tire size fits a 2018 Subaru Outback?
The 2018 Subaru Outback uses either 225/65R17 or 225/60R18, depending on the sub-model. The 2.5i and 2.5i Premium use 225/65R17, while the 2.5i Limited, 2.5i Touring, 3.6R Limited, and 3.6R Touring use 225/60R18. Both are radial tire sizes, but they are matched to different wheel diameters.
The practical takeaway is that trim level matters before tire shopping begins. A quick look at the door placard, existing tire sidewall, and actual wheel diameter helps confirm whether the Outback is still using its intended setup, especially if wheels have ever been changed.
What size rim does a 2018 Subaru Outback use?
A 2018 Subaru Outback uses either a 17-inch or 18-inch rim, depending on the sub-model. Outbacks fitted with 225/65R17 tires use 17-inch rims, while trims fitted with 225/60R18 tires use 18-inch rims. The tire size itself tells the rim diameter in the last number of the size code.
Rim diameter is the first thing to verify because a 17-inch tire cannot be mounted on an 18-inch wheel, and the reverse is also true. Checking the actual wheel on the vehicle is especially important when buying a used Outback or one that may have aftermarket wheels.
Why does the 2018 Subaru Outback have more than one tire size?
The 2018 Subaru Outback has more than one tire size because different sub-models use different wheel diameters. Some trims are fitted with 17-inch wheels and 225/65R17 tires, while others use 18-inch wheels and 225/60R18 tires. Both sizes are modern radial fitments, but they are not the same configuration.
That means the correct tire is determined by the exact trim and the wheel actually on the vehicle, not just by the model name. Even though the two sizes are close in overall proportions, the wheel difference makes proper identification essential before comparing tire options.
Choosing the Right Tire
What should I consider when choosing a 225/65R17 tire for a 2018 Subaru Outback?
Start with the basics: the tire must be the correct 225/65R17 size for an Outback sub-model that uses 17-inch wheels. Construction is radial, so the key comparisons are product character, load specification, sidewall style, and rim-width compatibility rather than choosing between vintage-style tire constructions.
The available 225/65R17 product is a BFGoodrich All-Terrain T/A KO2 with an RBL sidewall and a 6.0 to 8.0 inch rim-width range. That makes it worth checking how the vehicle is used, whether the wheels remain stock, and whether an all-terrain style suits the Outback's day-to-day driving.
What sidewall styles are available for 2018 Subaru Outback tires?
The available 225/65R17 product for the 2018 Subaru Outback uses an RBL sidewall style. That gives the tire a raised black letter appearance rather than a plain blackwall or vintage stripe treatment. On this vehicle, sidewall choice is more about appearance preference within a modern radial fitment than about restoration accuracy.
Since sidewall style affects how the tire looks on the vehicle, it helps to decide whether the Outback is being kept close to a stock visual presentation or given a more rugged look. Wheel design, ride height, and intended use can all influence whether a more aggressive sidewall appearance makes sense.
What brands offer tires for the 2018 Subaru Outback?
The currently available product selection for the 2018 Subaru Outback includes BFGoodrich in the 225/65R17 fitment. The tire series available in that size is the All-Terrain T/A KO2, which places the emphasis on a modern radial option with a more utility-focused tread character.
Brand matters most after the correct size and wheel diameter have been confirmed. Once the trim and wheel setup are verified, the next step is comparing whether the available tire's construction, sidewall treatment, load figure, and rim-width range match the way the Outback is actually used.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Subaru Outback?
Yes, modifications can affect tire fitment on a 2018 Subaru Outback. Aftermarket wheels, suspension changes, lift kits, lowering, or body alterations can all change the space available around the tire and can also alter the wheel width or offset the tire must work with.
That matters even when the tire size appears correct on paper. A modified Outback should be checked for actual wheel diameter, wheel width, steering clearance, and room at the fenders and suspension before any tire is chosen, especially if the vehicle no longer uses its original wheel package.
What should I inspect before driving a 2018 Subaru Outback on new tires?
Before driving a 2018 Subaru Outback on new tires, inspect the wheel size, mounting condition, air pressure, and the clearance around the tires at full steering lock. It is also smart to make sure the tires match the intended trim fitment and that there are no obvious issues such as rubbing, vibration, or uneven seating on the rim.
A careful first inspection helps catch avoidable problems early. After a short initial drive, recheck pressure and look again for any signs of contact at the fender liners or suspension, especially if the Outback has different wheels than it originally used or sees mixed on-road and rough-surface use.
What should I check before a longer drive in a 2018 Subaru Outback?
Before a longer drive in a 2018 Subaru Outback, check tire pressure, tread condition, sidewall condition, and any sign of slow air loss. The correct tire size should already be confirmed for the specific trim, and the tires should be free of cuts, bulges, or irregular wear that could point to alignment or suspension issues.
Longer trips put more importance on basic condition than many lightly used vehicles receive in normal local driving. It also helps to inspect the spare, confirm lug nuts are secure, and make sure the tires have adequate clearance and stable road behavior once the vehicle is fully loaded for travel.
