The 2020 Subaru WRX STI sits at the sharp end of the modern WRX lineup, carrying forward the model’s rally-bred reputation with aggressive handling, all-wheel-drive traction, and a chassis that rewards drivers who pay attention to setup. Tire choice matters on a car like this because the STI’s response, grip, and visual stance are closely tied to its factory-size footprint. This model uses a 245/35R19 radial tire on a 19-inch wheel, so the main decision is not size hunting so much as choosing the right tire within that fitment. Available options center on blackwall radial performance tires from BFGoodrich and Nitto, making it important to balance intended road use, wheel compatibility, and overall vehicle condition.
Which Tire Size Is Right for The 2020 Subaru WRX STI
The 2020 Subaru WRX STI uses one primary tire size: 245/35R19 in radial construction on a 19-inch rim. That fitment is shared across the Base, Limited, and Series.White models, so the decision is less about identifying a different factory size and more about choosing among the available radial tire options, checking wheel width, and matching the tire to the way the car is actually driven.
245/35R19 is a modern metric radial size in which 245 identifies the nominal section width in millimeters, 35 is the aspect ratio, R marks radial construction, and 19 is the wheel diameter in inches. On the 2020 Subaru WRX STI, that low-profile radial fitment supports the car’s sharp steering feel and wide-contact performance character. Available choices in this size include blackwall performance tires from BFGoodrich and Nitto, with tire series such as g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2. The key is selecting a tire that suits the car’s wheel width, intended use, and the condition of any suspension or alignment-related components.
Tire fitment is straightforward across the covered 2020 Subaru WRX STI sub-models because each uses the same 245/35R19 radial size. Sub-model identification still matters as a good ownership check, but the bigger decision is comparing the available tire choices within that shared fitment.
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2020 Subaru WRX STI Base
The 2020 Subaru WRX STI Base uses the same 245/35R19 radial fitment as the other covered STI sub-models. That keeps tire selection focused on choosing the right blackwall performance tire, confirming wheel compatibility, and matching the tire to street use, spirited driving, or mixed conditions.
The 2020 Subaru WRX STI Limited also uses 245/35R19 radial tires on 19-inch wheels. Since the fitment remains the same, the practical choice comes down to comparing the available tire series, checking wheel width against the tire’s approved range, and selecting a tire that fits the car’s use and setup.
The 2020 Subaru WRX STI Series.White shares the 245/35R19 radial tire size with the rest of the covered STI range. That means the selection process centers on product differences rather than alternate sizes, with attention paid to blackwall styling, wheel fit, and the car’s current alignment and suspension condition.
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 2020 Subaru WRX STI Tires for Sale
Available 245/35R19 choices for the 2020 Subaru WRX STI focus on blackwall radial performance tires from BFGoodrich and Nitto. The product grid lets buyers compare series differences such as g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2, along with wheel-width compatibility and other key specifications.
These FAQs focus on the 2020 Subaru WRX STI’s 245/35R19 tire fitment, 19-inch wheel compatibility, available radial tire choices, appearance considerations, and the checks worth making before putting a performance-oriented STI back on the road.
Tire Size & Fitment
What tire size fits a 2020 Subaru WRX STI?
The 2020 Subaru WRX STI uses a 245/35R19 radial tire. That is the primary fitment across the covered STI Base, Limited, and Series.White sub-models, so the size itself stays consistent throughout this model range.
The practical question is whether the car still has the correct 19-inch wheels and an appropriate wheel width for that tire. If the STI has aftermarket wheels, suspension changes, or alignment issues, verify wheel specifications and clearance before choosing among the available 245/35R19 options.
What size rim does a 2020 Subaru WRX STI use?
The 2020 Subaru WRX STI uses a 19-inch rim diameter with its 245/35R19 tire fitment. That 19-inch measurement is the wheel diameter the tire is built to mount on, not the tire’s overall outside diameter.
Wheel diameter is only part of the fitment picture, especially on a low-profile performance tire. Wheel width also matters, so it is worth confirming the actual wheel on the car before replacement, particularly if the STI no longer has its original wheel setup or has been modified for appearance or handling.
Do all 2020 Subaru WRX STI sub-models use the same tire size?
Yes. The covered 2020 Subaru WRX STI Base, Limited, and Series.White models all use the same 245/35R19 radial tire size. There is no primary size split among those sub-models, which makes replacement selection more straightforward.
That shared fitment means most owners can focus on tire type and wheel compatibility instead of chasing trim-specific sizing differences. Even so, it is smart to confirm the wheels currently on the car, since performance sedans are often changed with aftermarket wheels, lowering springs, or alignment settings that can affect usable clearance.
Choosing the Right Tire
What should I consider when choosing a 245/35R19 tire for a 2020 Subaru WRX STI?
Start with the correct size, which is 245/35R19, and confirm that the tire matches the car’s 19-inch wheel setup. From there, compare the available radial tire series, the approved wheel-width range where stated, and whether the tire suits the way the STI is actually used on the street.
A low-profile performance car places more emphasis on wheel fit, alignment condition, and suspension health than a taller-sidewall daily driver. Choosing between available options makes more sense after checking for uneven wear, verifying the wheel dimensions, and deciding whether the priority is all-season versatility or a more performance-focused road feel.
What sidewall styles are available for 2020 Subaru WRX STI tires?
The available 245/35R19 options for the 2020 Subaru WRX STI use a blackwall sidewall style. That keeps the appearance clean and contemporary, which suits the STI’s modern performance character without introducing vintage-style whitewall, redline, or raised-letter presentation.
Since the sidewall treatment stays consistent, the visual decision is simpler and the real comparison shifts to tire series and construction details. Buyers who care about appearance should still look closely at tread style, sidewall branding, and how the tire sits on the wheel, especially on cars with upgraded wheels or a lowered stance.
What brands offer tires for the 2020 Subaru WRX STI?
BFGoodrich and Nitto both offer 245/35R19 radial tires for the 2020 Subaru WRX STI. Within those brand choices, the available series include BFGoodrich g-Force Comp 2 AS, BFGoodrich g-Force Phenom T/A, and Nitto NT555 G2.
Brand selection should be treated as one part of the decision, not the whole answer. It helps to compare each tire’s series character, wheel-width suitability where stated, and how the car will be driven, then confirm the STI’s current wheel and suspension setup so the chosen tire makes sense on the actual vehicle.
Restoration & Appearance
Which tire should I choose for a period-style 2020 Subaru WRX STI?
A period-style approach on a 2020 Subaru WRX STI still points to the original 245/35R19 radial size, since this is a modern performance car rather than a vintage restoration project. Staying with the correct low-profile metric radial size preserves the car’s intended visual proportion far better than experimenting with alternate sizing formats.
Appearance decisions here are more about maintaining the STI’s modern stance than recreating a historic sidewall treatment. A blackwall tire in the proper size keeps the look cohesive, while wheel design, ride height, and alignment have a major effect on how the finished setup presents from curbside and at speed.
Does correct tire fitment matter for a 2020 Subaru WRX STI restoration or preservation build?
Yes, correct tire fitment still matters on a 2020 Subaru WRX STI, especially for owners trying to preserve the car’s intended proportions and handling character. Using the proper 245/35R19 size keeps the wheel-to-tire relationship aligned with the way this generation STI was meant to sit and respond.
A preservation-minded build benefits from resisting unnecessary size changes unless the entire wheel and suspension package has been reworked carefully. Even on a newer collector candidate, the tire influences appearance, steering response, and clearance, so keeping the fitment disciplined usually produces a result that feels more coherent and easier to live with.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2020 Subaru WRX STI?
Yes. Modifications such as aftermarket wheels, altered wheel offset, lowering springs, coilovers, or body changes can all affect how a 245/35R19 tire fits on a 2020 Subaru WRX STI. Even when the nominal tire size stays the same, the available space around the tire can change noticeably.
That matters because low-profile performance tires leave less room for error in the fender, strut, and steering-clearance areas. Any STI with modified suspension or wheels should be checked for rubbing, lock-to-lock clearance, and real wheel dimensions before replacement, rather than assuming the original-size tire will behave the same on a changed setup.
What should I inspect before driving a 2020 Subaru WRX STI on new tires?
Inspect the wheels for damage, confirm the 19-inch wheel setup, and look over alignment-related wear items before putting new tires on a 2020 Subaru WRX STI. It also makes sense to check for uneven wear patterns, damaged valve stems, and any suspension issues that could shorten tire life quickly.
After installation, monitor air pressure, steering feel, and clearance during the first drives. Performance cars can reveal an alignment problem or wheel-fit issue quickly, so paying attention to vibration, rubbing, or irregular wear early helps protect the new tires and gives a clearer picture of whether the STI’s chassis setup is truly in order.
How often should tires on a 2020 Subaru WRX STI be inspected?
Tires on a 2020 Subaru WRX STI should be inspected regularly, not just when tread looks low. A quick visual check before routine driving and a more careful inspection at service intervals can catch uneven wear, cuts, bulges, punctures, or pressure loss before they become bigger problems.
That habit matters even more on a performance-oriented car with low-profile 245/35R19 tires, since pothole damage and alignment changes can show up sooner than many owners expect. Cars that sit for long periods also deserve extra attention to pressure, flat-spotting, and sidewall condition before returning to regular road use.
