2008 BMW M3 Wheel Offset

Quick specs

Wheel size: 8x18 · 8.5x18 · 8.5x19 · 9x19
Offset: ET20 · ET29 · ET31
Backspacing: 4.79 in · 5.39 in · 5.72 in
Bolt pattern: 5×120
Center bore: 72.6 mm
Thread: M12×1.5
Tire size: 235/40R18 · 245/40R18 · 245/35R19

OEM configurations

Configuration	Front	Rear	Offset	Backspacing	Tire	Bolt pattern	Center bore	Thread
4.0 · 4.0L, S65B40A, V8, Petrol	8x18	8.5x18	ET20 / ET29	4.79 in	235/40R18 / 245/40R18	5x120	72.6 mm	M12 x 1.5
4.0 · 4.0L, S65B40A, V8, Petrol	8x18	8.5x18	ET20 / ET29	4.79 in	235/40R18 / 245/40R18	5x120	72.6 mm	M12 x 1.5
4.0 (ABA-VA40) · S65B40A, V8, Petrol	8x18	8.5x18	ET20 / ET29	4.79 in	235/40R18 / 245/40R18	5x120	72.6 mm	M12 x 1.5
4.0 (ABA-WD40) · S65B40A, V8, Petrol	8x18	8.5x18	ET20 / ET29	4.79 in	235/40R18 / 245/40R18	5x120	72.6 mm	M12 x 1.5

Wheels and hardware

Lug hardware

Wheel locks

Real-World 2008 BMW M3 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 — 8 documented builds
19-inch — 5 documented builds

13 documented builds.

Diameter

Staggered · 20×9 ET8 / 20×10 ET18

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: BBS LM-R

Front: 20×9 ET8 · 225/30R20
Rear: 20×10 ET18 · 295/25R20

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 24.7 mm farther toward fender (more outward poke)
Inner edge 0.7 mm closer to suspension (less inner clearance)
Width +1" vs OEM
Diameter +2" vs OEM

View full build on Modified1

Staggered · 19×9 ET20 / 19×10 ET25

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: BBS RGR

Front: 19×9 ET20 · 255/35R19
Rear: 19×10 ET25 · 275/35R19

Compared with OEM

Compared with the 18×8 ET20 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 · 19×9.5 ET22 / 19×10.5 ET22

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: Volk TE37

Front: 19×9.5 ET22 · 245/30R19
Rear: 19×10.5 ET22 · 285/35R19

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 17 mm farther toward fender (more outward poke)
Inner edge 21 mm closer to suspension (less inner clearance)
Width +1.5" vs OEM
Diameter +1" vs OEM

View full build on Modified1

Staggered · 20×9.5 ET28 / 20×10.5 ET28

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: HRE P40

Front: 20×9.5 ET28 · 255/30R20
Rear: 20×10.5 ET28 · 285/30R20

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 11 mm farther toward fender (more outward poke)
Inner edge 27 mm closer to suspension (less inner clearance)
Width +1.5" vs OEM
Diameter +2" vs OEM

View full build on Modified1

Staggered · 19×8.5 ET30 / 19×10.5 ET25

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: Volk Racing TE37

Front: 19×8.5 ET30 · 245/35R19
Rear: 19×10.5 ET25 · 275/35R19

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 3.7 mm less outward poke
Inner edge 16.3 mm closer to suspension (less inner clearance)
Width +0.5" vs OEM
Diameter +1" vs OEM

View full build on Modified1

Staggered · 20×8.5 ET29 / 20×10 ET22

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: O.Z. Ultraleggera HLT

Front: 20×8.5 ET29 · 245/30R20
Rear: 20×10 ET22 · 275/30R20

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 2.7 mm less outward poke
Inner edge 15.3 mm closer to suspension (less inner clearance)
Width +0.5" vs OEM
Diameter +2" vs OEM

View full build on Modified1

Staggered · 20×? / 20×?

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: Concave Forged

Front: 20×? · 245/30R20
Rear: 20×? · 305/25R20

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +2" vs OEM

View full build on Modified1

Staggered · 20×9 / 20×11

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: 360 Forged SL10

Front: 20×9
Rear: 20×11

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +2" vs OEM

View full build on Modified1

Staggered · 20×9 / 20×11

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: Forged SL10

Front: 20×9 · 255/30R20
Rear: 20×11 · 285/30R20

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +2" vs OEM

View full build on Modified1

Staggered · 20×? / Rear unknown

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: Breyton GTS

Front: 20×?
Rear: —

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +2" vs OEM

View full build on Modified1

Staggered · 19×8.5 / 19×9.5

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: BBS CH

Front: 19×8.5
Rear: 19×9.5

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +1" vs OEM

View full build on Modified1

Staggered · 19×? / Rear unknown

Documented on a 2008 BMW M3 build — observed custom fitment, not a universal fit guarantee.

Wheel: Breyton GTS

Front: 19×?
Rear: —

Compared with OEM

Compared with the 18×8 ET20 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +1" vs OEM

View full build on Modified1

Documented diameter × width pages

Aftermarket wheel sizes with enough documented Modified1 builds for this model year. Evidence pages — not fit guarantees.

20×93 builds

Compare your own setup

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

OEM: 18×8 ET20 · 235/40R18 · Front · 4.0 · 4.0L, S65B40A, V8, Petrol

New width (in)New offset (mm)

Outer: +0 mm
Inner clearance: 0 mm unchanged

Open full fitment calculator

More specs for the 2008 BMW M3

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.