2008 Audi RS 4 Wheel Offset

ET24 · ET29 · ET21

Quick specs

OEM offset: ET24 · ET29 · ET21
Wheel size: 8.5x18 · 8x19 · 9x19 · 7.5x18
Backspacing: 5.19 in · 5.14 in · 5.64 in · 4.58 in
Bolt pattern: 5×112
Center bore: 57.1 mm
Tire size: 255/40R18 · 235/40R19 · 255/35R19 · 225/45R18

OEM configurations

Configuration	Front	Rear	Offset	Backspacing	Tire	Bolt pattern	Center bore	Thread
4.2 Quattro · 4.2L, V8, Petrol	8.5x18	7.5x18	ET24 / ET21	5.19 in	255/40R18 / 225/45R18	5x112	57.1 mm	M14 x 1.5
4.2 Quattro · 4.2L, V8, Petrol	8x19	7.5x18	ET29 / ET21	5.14 in	235/40R19 / 225/45R18	5x112	57.1 mm	M14 x 1.5
4.2 Quattro · 4.2L, V8, Petrol	9x19	7.5x18	ET29 / ET21	5.64 in	255/35R19 / 225/45R18	5x112	57.1 mm	M14 x 1.5

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

OEM baseline

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Wheels and hardware for this vehicle

Lug hardware

Wheel locks

Real-World 2008 Audi RS 4 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:

20-inch — 10 documented builds
19-inch — 9 documented builds
18-inch — 2 documented builds

21 documented builds.

Diameter

Staggered · 19×8.5 ET40 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: BBS CH-R

Front: 19×8.5 ET40 · 235/40R19
Rear: —

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 4.7 mm less outward poke
Inner edge 17.3 mm closer to suspension (less inner clearance)
Width +0.5" vs OEM

View full build on Modified1

Staggered · 19×10 ET29 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: Forgeline GA1R

Front: 19×10 ET29 · 285/30R19
Rear: —

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 25.4 mm farther toward fender (more outward poke)
Inner edge 25.4 mm closer to suspension (less inner clearance)
Width +2" vs OEM

View full build on Modified1

Staggered · 20×9 ET29 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: OEM Audi A5

Front: 20×9 ET29
Rear: —

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 12.7 mm farther toward fender (more outward poke)
Inner edge 12.7 mm closer to suspension (less inner clearance)
Width +1" vs OEM
Diameter +1" vs OEM

View full build on Modified1

Staggered · 19×10 ET29 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: Forgeline GA1R

Front: 19×10 ET29
Rear: —

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 25.4 mm farther toward fender (more outward poke)
Inner edge 25.4 mm closer to suspension (less inner clearance)
Width +2" vs OEM

View full build on Modified1

Staggered · 19×9.5 ET20 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: Avant Garde M550

Front: 19×9.5 ET20 · 275/30R19
Rear: —

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 28 mm farther toward fender (more outward poke)
Inner edge 10 mm closer to suspension (less inner clearance)
Width +1.5" vs OEM

View full build on Modified1

Staggered · 20×10 ET20 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: Avant Garde M580

Front: 20×10 ET20
Rear: —

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 34.4 mm farther toward fender (more outward poke)
Inner edge 16.4 mm closer to suspension (less inner clearance)
Width +2" vs OEM
Diameter +1" vs OEM

View full build on Modified1

Staggered · 20×9 ET25 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: BBS CH-R

Front: 20×9 ET25 · 255/30R20
Rear: —

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 16.7 mm farther toward fender (more outward poke)
Inner edge 8.7 mm closer to suspension (less inner clearance)
Width +1" vs OEM
Diameter +1" vs OEM

View full build on Modified1

Staggered · 18×9 ET25 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: Advan TCIII

Front: 18×9 ET25 · 265/35R18
Rear: —

Compared with OEM

Compared with the 18×8.5 ET24 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 5.4 mm farther toward fender (more outward poke)
Inner edge 7.4 mm closer to suspension (less inner clearance)
Width +0.5" vs OEM

View full build on Modified1

Staggered · 19×10 ET42 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: Forgestar F14

Front: 19×10 ET42 · 255/35R19
Rear: —

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 12.4 mm farther toward fender (more outward poke)
Inner edge 38.4 mm closer to suspension (less inner clearance)
Width +2" vs OEM

View full build on Modified1

Staggered · 20×10 ET32 / 20×10 ET25

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: HRE 943r

Front: 20×10 ET32 · 255/30R20
Rear: 20×10 ET25

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 22.4 mm farther toward fender (more outward poke)
Inner edge 28.4 mm closer to suspension (less inner clearance)
Width +2" vs OEM
Diameter +1" vs OEM

View full build on Modified1

Staggered · 19×9.5 ET26 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: HRE P43SC

Front: 19×9.5 ET26 · 255/35R19
Rear: —

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 22 mm farther toward fender (more outward poke)
Inner edge 16 mm closer to suspension (less inner clearance)
Width +1.5" vs OEM

View full build on Modified1

Staggered · 19×8.5 ET35 / Rear unknown

Documented on a 2008 Audi RS 4 build — observed custom fitment, not a universal fit guarantee.

Wheel: Kahn RS-S

Front: 19×8.5 ET35
Rear: —

Compared with OEM

Compared with the 19×8 ET29 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 0.3 mm farther toward fender (more outward poke)
Inner edge 12.3 mm closer to suspension (less inner clearance)
Width +0.5" vs OEM

View full build on Modified1

More specs for the 2008 Audi RS 4

OEM offsets are catalog configurations, not an aftermarket “safe ET range.” Matching offset alone does not confirm clearance. Documented custom builds are observed setups only.