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Subaru WRX STI tire size

Original tire sizes for the Subaru WRX STI, model years 2015, 2016, 2017, 2018, 2019, 2020 and 2021. Trim levels and wheel packages change the size within the same year, so confirm on the door-jamb sticker before ordering.

Front and rear Same size One size fits all four corners on the fitments we list.
Wheel sizes 18" Every fitment we list uses this diameter.
Tire sizes listed 1 One size per model year across the years we cover.

Check before you order. The surest answer is the tires on the car right now: the size is molded into the sidewall. The placard inside the driver's door tells you what the factory fitted. Our guide on reading a tire size shows exactly where to look.

Subaru WRX STI
Shown: 2018 Subaru WRX STi. Photo: Koenigseggvibes, CC BY-SA 4.0, via Wikimedia Commons

Size by year and trim

Model yearsTrim or packageTire sizeFrom
2015-2021 Standard 245/40R18 $95

Tire size by model year

Model yearTire sizeTrim or packageFrom
2021 Subaru WRX STI 245/40R18 Standard $95
2020 Subaru WRX STI 245/40R18 Standard $95
2019 Subaru WRX STI 245/40R18 Standard $95
2018 Subaru WRX STI 245/40R18 Standard $95
2017 Subaru WRX STI 245/40R18 Standard $95
2016 Subaru WRX STI 245/40R18 Standard $95
2015 Subaru WRX STI 245/40R18 Standard $95

Which brand should you pick?

Subaru does not stamp its own approval code on tires the way Porsche or BMW do. Any tire in the right size that meets or exceeds the load index and speed rating on your door placard is a legitimate replacement, so pick on wet braking, tread life and price. Our picks for each size are on the size pages below.

Check this before you order
The tire and loading information placard on a car door jamb
Open the driver's door. The placard sits on the jamb or the B-pillar.
TIRE AND LOADING INFORMATIONSUBARU WRX STI ORIGINAL EQUIPMENT SIZESYour own placard also gives the pressures and the load limitTIRESIZECOLD TIRE PRESSUREFRONT245/40R18SEE YOUR PLACARDREAR245/40R18SEE YOUR PLACARDTHIS IS THE SIZE YOU ORDER

The drawing carries the sizes we list for this car, so you know what you are looking for. The placard on the car is still the final word, and it is the only place that gives the cold pressures: the number molded into the sidewall is the maximum the tire can hold, not what your car wants.

What those tires cost

All four corners 245/40R18 1 of the listed WRX STI builds from $95 per tire

Subaru WRX STI tires: common questions

What size tires does a Subaru WRX STI take?

The most common original size is 245/40R18. Other model years and trims use different sizes, so check the list on this page and confirm against the sticker inside your driver's door.

Can I fit a different size on my Subaru WRX STI?

You can, within limits: the overall diameter should stay within about 3 percent of the original, and the load index and speed rating must meet or exceed the door placard. Anything further changes your speedometer reading and can rub at full lock.

Where is the tire size on a Subaru WRX STI?

Open the driver's door and look at the white and yellow placard on the door jamb or the B-pillar. The same size is also molded into the sidewall of the tires currently on the car, unless someone changed them.

What size tires does a 2021 Subaru WRX STI take?

The 2021 Subaru WRX STI came from the factory on 245/40R18. Wheel packages can change that within the same model year, so check the placard inside the door jamb before you order.

What size tires does a 2020 Subaru WRX STI take?

The 2020 Subaru WRX STI came from the factory on 245/40R18. Wheel packages can change that within the same model year, so check the placard inside the door jamb before you order.

What size tires does a 2019 Subaru WRX STI take?

The 2019 Subaru WRX STI came from the factory on 245/40R18. Wheel packages can change that within the same model year, so check the placard inside the door jamb before you order.