Subaru WRX STI VA (2015-2021) Wheel Fitment Guide

Q: What wheels came stock on the 2015–2021 WRX STI?

The 2015–2017 STI came on 18x8.5 ET55 wheels with 245/40R18 tires, and 2018–2021 cars on 19x8.5 ET55 with 245/35R19. Limited editions added BBS forged wheels in the same sizes, and the 2019 S209 got a 19x9 ET48 BBS wheel on 265/35R19 tires. Every factory setup is square, front and rear the same.

Q: What are the WRX STI's bolt pattern, center bore and lug nut specs?

Every 2015–2021 STI uses a 5x114.3 bolt pattern, a 56.1mm center bore and M12x1.25 lug nuts with a 60-degree conical seat, torqued to 89 lb-ft (120 Nm). FMB machines STI wheels for 60-degree conical nuts and bores every set to the 56.1mm hub, so the wheels center on the hub without rings.

Q: What aftermarket wheel sizes fit the STI at stock ride height?

Based on our research of owner-submitted setups, 18x9.5 at ET35–ET38 is the most common choice, usually on 245/40, 255/35 or 265/35R18 tires with no fender work reported. 18x8.5 ET35 and 19x9.5 ET35 are also documented on dozens of stock-height cars. Wider than 9.5-inch, most owners lower the car and roll the fenders.

Q: What winter wheels work on the STI?

Most owners run winter tires on 18x8 to 18x8.5 wheels around ET40–ET50 with 245/40R18 tires, which suits both Brembo generations. A few 2018–2021 owners document 17x8 winter sets, but only specific 17-inch designs clear the six-piston calipers, so FMB confirms caliper clearance for your car before forging.

Q: Do WRX wheels fit the STI, and do STI wheels fit the WRX?

The 2015–2021 WRX shares the STI's 5x114.3 pattern, 56.1mm hub and M12x1.25 nuts, and the same ET55 factory offset. STI wheels fit a WRX easily because its brakes are smaller. WRX wheels don't always clear STI Brembos: the 17-inch base wheel doesn't, and the 2018–2019 WRX 18-inch wheel doesn't clear the four-piston STI brakes.

Every 2015–2021 WRX STI uses a 5×114.3 bolt pattern, a 56.1mm center bore and M12×1.25 lug nuts with a 60° conical seat. Factory wheels are 18×8.5 ET55 (2015–2017) and 19×8.5 ET55 (2018–2021), with a wider 19×9 ET48 on the S209. This guide covers Brembo clearance by model year and why every setup stays square.

About this guide: Fitment data is compiled from owner builds in owner-submitted fitment galleries and customer cars in wheel-maker fitment galleries, cross-checked against vendor fitment documentation. Use it as research for your build; ride height, tires, and alignment are still your installer's call.

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OEM Setups

Factory Wheel & Tire Configurations

The 2015–2017 STI came on an 18″ wheel with four-piston Brembo front calipers. The 2018 refresh moved every STI to a 19″ wheel and six-piston monoblock Brembos. Limited editions added BBS forged wheels, and the 2019 S209 got a wider body and its own wheel. Every STI shares the same hub and lug hardware.

WRX STI Hub & Hardware Specs

All trims — 2015–2021

Bolt Pattern5×114.3

Center Bore56.1mm

Fastener TypeLug Nuts

Thread PitchM12×1.25

Seat Type60° Conical

Torque Spec89 lb-ft (120 Nm)

Factory OffsetET55 front / ET55 rear (S209: ET48)

Brake SystemBrembo 4-piston front / 2-piston rear (2015–2017); Brembo 6-piston monoblock front / 2-piston rear (2018–2021)

19″ Y-Spoke Alloy

Standard — 2018–2021

Front Wheel19×8.5 ET55

Rear Wheel19×8.5 ET55

Front Tire245/35R19

Rear Tire245/35R19

ConstructionCast Aluminum

Applies To2018–2021 STI and STI Limited; black finish on the 2019 Series.Gray

Standard on every 2018–2021 STI, introduced with the refresh that brought six-piston front Brembos. Gunmetal on 2018–2019 cars and gunmetal with machined accents from 2020. One OEM parts retailer notes it doesn't clear the 2015–2017 four-piston calipers without a 5mm spacer, so check before moving it to an older car.

18″ Alloy

Standard — 2015–2017

Front Wheel18×8.5 ET55

Rear Wheel18×8.5 ET55

Front Tire245/40R18

Rear Tire245/40R18

ConstructionCast Aluminum

Applies To2015–2017 STI and STI Limited

Standard on 2015–2017 cars with four-piston front Brembos; the design changed after 2015 but the size and offset didn't. OEM parts retailers list it as clearing both Brembo generations, so it moves to a 2018–2021 STI as a winter or second set. It's the reference wheel for the 18-inch lip figures on this page.

BBS Forged 18″ (Launch Edition / Series.HyperBlue)

Limited editions — 2015–2016

Front Wheel18×8.5 ET55

Rear Wheel18×8.5 ET55

Front Tire245/40R18

Rear Tire245/40R18

ConstructionForged Aluminum

Applies To2015 Launch Edition (gold); 2016 Series.HyperBlue (black)

The same size and offset as the standard 18″ wheel, forged by BBS and listed at about 22 lb per wheel. Gold on the 2015 Launch Edition and black on the 2016 Series.HyperBlue. OEM parts retailers list it as clearing every factory Subaru brake, including the 2018–2021 six-piston Brembos.

BBS Forged 19″ (Type RA / Series.White)

Limited editions — 2018 and 2020

Front Wheel19×8.5 ET55

Rear Wheel19×8.5 ET55

Front Tire245/35R19

Rear Tire245/35R19

ConstructionForged Aluminum

Applies To2018 Type RA (500 units); 2020 Series.White, matte bronze (500 units)

A lightweight BBS forged version of the 19″ size, about 24 lb per wheel against roughly 28 lb for the cast wheel. The Type RA ran Yokohama Advan Sport tires and the Series.White ran Michelin Pilot Sport Cup 2 tires. Same size and offset as the standard 19″ wheel, so it fits any 2018–2021 STI.

S209 BBS Forged 19″

Limited edition — 2019

Front Wheel19×9 ET48

Rear Wheel19×9 ET48

Front Tire265/35R19

Rear Tire265/35R19

ConstructionForged Aluminum

Applies To2019 S209 only (209 units)

Wider and lower offset than any other STI wheel, on Dunlop SP Sport Maxx GT600A tires. The S209's wider fenders add about 1.7 inches of body width and 0.6 inches of track front and rear, so these wheels sit further out on a standard body than the factory wheel. It's the reference for the S209, not the lip figures on this page.

Aftermarket Options

Aftermarket Wheel & Tire Configurations

Each card below is one wheel size, and each row is one owner build, or several at the same effective offset. Spacer builds are listed at the offset we would machine into the wheel. Front and Rear figures show how far each lip sits outside the factory 8.5J ET55 wheel.

Setup	Tires (front · rear)	Stance	Fit	Drivetrain	Sources
Square — same size all four corners
18×9.5 ★ET15–45	Varies by build	●●●●●	Bolt-on · Lowered · May rub · Mods may be needed	AWD only	476
18×8.5ET10–50	Varies by build	●●●●●	Bolt-on · Lowered · May rub · Mods may be needed	AWD only	76
19×8.5ET30–50	Varies by build	●●●●●	Bolt-on · Lowered · May rub · Mods may be needed	AWD only	34
18×8ET20–40	Varies by build	●●●●●	Bolt-on · Mods may be needed	AWD only	5
17×8ET35–42	Varies by build	●●●●●	Bolt-on	AWD only	8
19×8ET41	245/35R19 · 245/35R19	●●●●●	Bolt-on	AWD only	1
19×9.5ET15–45	Varies by build	●●●●●	Bolt-on · Lowered · May rub · Mods may be needed	AWD only	66
18×9ET10–38	Varies by build	●●●●●	Bolt-on · Lowered · May rub · Mods may be needed	AWD only	24
19×9ET35–38	Varies by build	●●●●●	Bolt-on · Lowered	AWD only	4
18×10ET9–41	Varies by build	●●●●●	Bolt-on · Lowered · May rub · Mods may be needed	AWD only	29
17×9.5ET35	245/40R17 · 245/40R17	●●●●●	Bolt-on	AWD only	1
19×10ET30–40	Varies by build	●●●●●	Lowered · Mods may be needed	AWD only	3
20×9ET35	265/30R20 · 265/30R20	●●●●●	Lowered	AWD only	1
18×10.5ET15–22	Varies by build	●●●●●	Bolt-on · Lowered · May rub · Mods may be needed	AWD only	4
19×10.5ET30	255/35R19 · 255/35R19	●●●●●	Lowered · Mods may be needed	AWD only	1

Tap a setup to jump to its full card. Fit: Bolt-on = documented at stock ride height with no fender work reported · Lowered = documented on lowering springs or coilovers · Not reported = owners didn't say. Sources = owner builds (including customer cars in vendor galleries) and vendor fitment-guide setups documented on that card.

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⚠️ Platform-specific fitment notes — WRX STI

Fender clearance past 9.5″ widths.

Most owners run 18×9.5 at ET35–ET38, about 30–33mm outside the factory wheel, at stock height with 245 to 265 tires. Going wider or lower in offset is documented mostly on coilovers with rolled fenders and extra camber, and 10″ widths carry reports of rubbing. Tire brands run different widths at the same size, so a 265 that clears on one can rub on another.

Brake clearance by model year.

2015–2017 STIs use four-piston front Brembos; 2018–2021 cars use larger six-piston monoblock Brembos. Nearly every setup here is 18″ or larger, and on six-piston cars only specific 17″ designs clear the caliper. Spoke shape matters as much as diameter, so FMB checks caliper clearance for your brake package before forging.

Lug nuts and hub fit.

The STI uses M12×1.25 lug nuts with a 60° conical seat, the seat FMB machines for, and every set is bored to the 56.1mm hub, so no hub-centric rings are needed. If the wheel's mounting pad is thicker than stock, have your installer confirm thread engagement.

Square Setup

What happens when you build with FMB

Built to the exact spec, not the closest one on a shelf. The setups above come from real WRX STI builds, and we CNC-machine every wheel to them directly. If a build needs a spacer to reach its offset, we machine that offset into the wheel instead.

Choose your setup.
This guide is built to give you what you need to pick a spec with confidence: documented WRX STI builds, tire sizes, and how each one fits. If you still have questions, we're happy to help before you order.
Engineering verification.
Our manufacturing partner confirms wheel specs, including bolt pattern, center bore, brake caliper clearance, backspacing and load rating.
Render approval.
You approve the design and final specs before we move forward with production.

Our fitment guarantee

Every set is guaranteed to mount on your WRX STI: 5×114.3 bolt pattern, bored to the 56.1mm hub, machined for 60° conical lug nuts, and made to the exact width and offset you approved.

How a setup sits on your car also depends on ride height, tires and alignment, so choose with your plans in mind.

Start your WRX STI build →

Common Questions

FAQ — Frequently Asked Questions

What wheels came stock on the 2015–2021 WRX STI?

The 2015–2017 STI came on 18×8.5 ET55 wheels with 245/40R18 tires, and 2018–2021 cars on 19×8.5 ET55 with 245/35R19. Limited editions added BBS forged wheels in the same sizes, and the 2019 S209 got a 19×9 ET48 BBS wheel on 265/35R19 tires. Every factory setup is square, front and rear the same.

What are the WRX STI's bolt pattern, center bore and lug nut specs?

Every 2015–2021 STI uses a 5×114.3 bolt pattern, a 56.1mm center bore and M12×1.25 lug nuts with a 60° conical seat, torqued to 89 lb-ft (120 Nm). FMB machines STI wheels for 60° conical nuts and bores every set to the 56.1mm hub, so the wheels center on the hub without rings.

What aftermarket wheel sizes fit the STI at stock ride height?

Based on our research of owner-submitted setups, 18×9.5 at ET35–ET38 is the most common choice, usually on 245/40, 255/35 or 265/35R18 tires with no fender work reported. 18×8.5 ET35 and 19×9.5 ET35 are also documented on dozens of stock-height cars. Wider than 9.5″, most owners lower the car and roll the fenders.

How do I read the offset ladder on these cards?

Each card is one wheel size, and each row is a documented build at its effective offset, ordered from least to most outboard. Front and Rear show how far each lip sits outside the factory 8.5J ET55 wheel. The stance dots show the range the rows cover, and chips mark stock height, lowered cars and spacer builds.

Will aftermarket wheels clear the STI's Brembo brakes?

2015–2017 STIs use four-piston front Brembos and 2018–2021 cars use larger six-piston monoblock calipers. Almost every documented setup is 18″ or larger; only specific 17″ designs clear the six-piston brakes. Spoke shape matters as much as diameter, and FMB's engineering verification checks caliper clearance for your brake package before forging.

Why is every STI setup in this guide square?

The STI is all-wheel drive with a center differential, and staggered setups can create front-to-rear rolling diameter mismatches that may stress the drivetrain over time. Subaru only ever fitted square setups, and only one staggered owner build turned up in our research, so none are documented here. Check your owner manual before changing tire sizes.

Do spacer builds show up in this guide?

Yes. A build documented with spacers is listed at its effective offset, the wheel's offset minus the spacer, and the row carries a Via spacers chip. For example, an 18×9.5 ET38 wheel on a 10mm spacer appears as ET28. FMB machines that offset into the wheel directly, so you don't need the spacer.

What winter wheels work on the STI?

Most owners run winter tires on 18×8 to 18×8.5 wheels around ET40–ET50 with 245/40R18 tires, which suits both Brembo generations. A few 2018–2021 owners document 17×8 winter sets, but only specific 17″ designs clear the six-piston calipers, so FMB confirms caliper clearance for your car before forging.

Which model years does this guide cover?

It covers the 2015–2021 WRX STI sold in the US (VA chassis), including the Launch Edition, Series.HyperBlue, Type RA, S209, Series.Gray and Series.White. 2021 was the final STI model year; the 2022 and later WRX was not offered as an STI, so those cars aren't covered here.

Do WRX wheels fit the STI, and do STI wheels fit the WRX?

The 2015–2021 WRX shares the STI's 5×114.3 pattern, 56.1mm hub and M12×1.25 nuts, and the same ET55 factory offset. STI wheels fit a WRX easily because its brakes are smaller. WRX wheels don't always clear STI Brembos: the 17″ base wheel doesn't, and the 2018–2019 WRX 18″ wheel doesn't clear the four-piston STI brakes.

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