2015 Subaru WRX STI Wheel Offset

Quick specs

Wheel size: Multiple — see configurations
Offset: Multiple — see configurations
Backspacing: Multiple — see configurations
Bolt pattern: 5×114.3
Center bore: 56.1 mm
Thread: M12×1.25
Tire size: Multiple — see configurations

OEM configurations

Configuration	Front	Rear	Offset	Backspacing	Tire	Bolt pattern	Center bore	Thread
2.5T · EJ25, H4, Petrol	8.5x18	—	ET55	6.42 in	245/40R18	5x114.3	56.1 mm	M12 x 1.25
2.5T · EJ25, H4, Petrol	8.5x19	11x20	ET55	6.42 in	255/35R19	5x114.3	56.1 mm	M12 x 1.25
2.5T · EJ25, H4, Petrol	9x20	11x20	ET48 / ET55	6.39 in	255/30R20	5x114.3	56.1 mm	M12 x 1.25
2.5T · 2.5L, EJ257, H4, Petrol	8.5x18	8.5x19	ET55	6.42 in	245/40R18 / 245/35R19	5x114.3	56.1 mm	M12 x 1.25
2.5T · 2.5L, EJ257, H4, Petrol	9x20	8.5x19	ET48 / ET55	6.39 in	255/30R20 / 245/35R19	5x114.3	56.1 mm	M12 x 1.25
2.0T (CBA-VAB) · EJ20, H4, Petrol	8x19	—	ET50	5.97 in	265/30R19	5x114.3	56.1 mm	M12 x 1.25
2.0T (CBA-VAB) · EJ20, H4, Petrol	7.5x16	—	ET60	6.11 in	235/40R16	5x114.3	56.1 mm	M12 x 1.25
2.0T (CBA-VAB) · EJ20, H4, Petrol	9x16	—	ET63	6.98 in	235/55R16	5x114.3	56.1 mm	M12 x 1.25
2.0T (CBA-VAB) · EJ20, H4, Petrol	8x18	—	ET55	6.17 in	235/55R18	5x114.3	56.1 mm	M12 x 1.25
2.0T (CBA-VAB) · EJ20, H4, Petrol	9x19	—	ET50	6.47 in	225/25R19	5x114.3	56.1 mm	M12 x 1.25
2.0T (CBA-VAB) · EJ20, H4, Petrol	8x20	10x20	ET43 / ET51	5.69 in	255/20R20	5x114.3	56.1 mm	M12 x 1.25
2.0T S207 (CBA-VAB) · EJ20, H4, Petrol	8.5x21	7.5x19	ET48 / ET50	6.14 in	265/30R21 / 235/45R19	5x114.3	56.1 mm	M12 x 1.25

Wheels and hardware

Lug hardware

Wheel locks

Real-World 2015 Subaru WRX STI Wheel Setups

Observed aftermarket setups from documented Modified1 builds. These are individual build records — not OEM specifications and not clearance guarantees for every vehicle.

Common custom wheel sizes

Among builds in our database for this model year:

18-inch — 4 documented builds

4 documented builds.

Staggered · 18×9.5 ET38 / Rear unknown

Documented on a 2015 Subaru WRX STI build — observed custom fitment, not a universal fit guarantee.

Wheel: Rota T2R

Front: 18×9.5 ET38 · 245/40R18
Rear: —

Compared with OEM

Compared with the 18×8 ET55 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 36 mm farther toward fender (more outward poke)
Inner edge 2 mm closer to suspension (less inner clearance)
Width +1.5" vs OEM

View full build on Modified1

Staggered · 18×10 / Rear unknown

Documented on a 2015 Subaru WRX STI build — observed custom fitment, not a universal fit guarantee.

Wheel: ADV.1 10M Track Function CS

Front: 18×10
Rear: —

Compared with OEM

Compared with the 18×8 ET55 OEM configuration. Calculated geometry only — not fit confirmation.

View full build on Modified1

Staggered · 18×9.5 / Rear unknown

Documented on a 2015 Subaru WRX STI build — observed custom fitment, not a universal fit guarantee.

Wheel: ADV.1 5S MV2

Front: 18×9.5
Rear: —

Compared with OEM

Compared with the 18×8 ET55 OEM configuration. Calculated geometry only — not fit confirmation.

View full build on Modified1

Staggered · 18×9.5 / Rear unknown

Documented on a 2015 Subaru WRX STI build — observed custom fitment, not a universal fit guarantee.

Wheel: ADV.1 5S MV2

Front: 18×9.5
Rear: —

Compared with OEM

Compared with the 18×8 ET55 OEM configuration. Calculated geometry only — not fit confirmation.

View full build on Modified1

Compare your own setup

See how a different width or offset sits versus an OEM configuration for this year.

OEM baseline

Open full fitment calculator

More specs for the 2015 Subaru WRX STI

Each OEM row is a catalog configuration. Offset ranges are not collapsed when the database has exact setups. Documented aftermarket builds are observed setups only — not universal fit or clearance confirmation.