2008 Chevrolet Silverado 1500 Wheel Offset

Quick specs

Wheel size: 7.5x17 · 8x18 · 8.5x20
Offset: ET31
Backspacing: 4.97 in · 5.22 in · 5.47 in
Bolt pattern: 6×139.7
Center bore: 78.1 mm
Thread: M14×1.5
Tire size: 245/70R17 · 265/70R17 · 265/65R18 · 275/55R20

OEM configurations

Configuration	Front	Rear	Offset	Backspacing	Tire	Bolt pattern	Center bore	Thread
4.3 · V6, Petrol	7.5x17	—	ET31	4.97 in	245/70R17	6x139.7	78.1 mm	M14 x 1.5
4.3 · V6, Petrol	7.5x17	—	ET31	4.97 in	265/70R17	6x139.7	78.1 mm	M14 x 1.5
4.3 · V6, Petrol	8x18	—	ET31	5.22 in	265/65R18	6x139.7	78.1 mm	M14 x 1.5
4.3 · V6, Petrol	8.5x20	10.5x20	ET31 / ET35	5.47 in	275/55R20	6x139.7	78.1 mm	M14 x 1.5
4.8 · 4.8L, V8, Petrol	7.5x17	—	ET31	4.97 in	245/70R17	6x139.7	78.1 mm	M14 x 1.5
4.8 · 4.8L, V8, Petrol	7.5x17	—	ET31	4.97 in	265/70R17	6x139.7	78.1 mm	M14 x 1.5
4.8 · 4.8L, V8, Petrol	8.5x20	10.5x20	ET31 / ET35	5.47 in	275/55R20	6x139.7	78.1 mm	M14 x 1.5
4.8 · 4.8L, V8, Petrol	8x18	—	ET31	5.22 in	265/65R18	6x139.7	78.1 mm	M14 x 1.5
5.3 · V8, Petrol	7.5x17	—	ET31	4.97 in	245/70R17	6x139.7	78.1 mm	M14 x 1.5
5.3 · V8, Petrol	7.5x17	—	ET31	4.97 in	265/70R17	6x139.7	78.1 mm	M14 x 1.5
5.3 · V8, Petrol	8x18	—	ET31	5.22 in	265/65R18	6x139.7	78.1 mm	M14 x 1.5
5.3 · V8, Petrol	8.5x20	10.5x20	ET31 / ET35	5.47 in	275/55R20	6x139.7	78.1 mm	M14 x 1.5
6.0 · V8, Petrol	7.5x17	—	ET31	4.97 in	245/70R17	6x139.7	78.1 mm	M14 x 1.5
6.0 · V8, Petrol	7.5x17	—	ET31	4.97 in	265/70R17	6x139.7	78.1 mm	M14 x 1.5
6.0 · V8, Petrol	8x18	—	ET31	5.22 in	265/65R18	6x139.7	78.1 mm	M14 x 1.5
6.0 · V8, Petrol	8.5x20	10.5x20	ET31 / ET35	5.47 in	275/55R20	6x139.7	78.1 mm	M14 x 1.5

Wheels and hardware

Lug hardware

Wheel locks

Real-World 2008 Chevrolet Silverado 1500 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:

22-inch — 5 documented builds
20-inch — 3 documented builds
24-inch — 3 documented builds
18-inch — 2 documented builds
17-inch — 1 documented build

14 documented builds.

DiameterLayout

2008 Chevrolet Silverado 1500 custom wheel setup

18×9 ET18

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Tires: 275/65R18

Suspension: Leveling Kit

Compared with OEM

Compared with the 18×8 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 25.7 mm farther toward fender (more outward poke)
Inner edge 0.3 mm farther from suspension (more inner clearance)
Width +1" vs OEM

View full build on Modified1

20×14 ET-77

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Tires: 38/13.5R20

Compared with OEM

Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 177.8 mm farther toward fender (more outward poke)
Inner edge 38.2 mm farther from suspension (more inner clearance)
Width +5.5" vs OEM

View full build on Modified1

18×9 ET0

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Tires: 275/70R18

Suspension: Leveling Kit

Compared with OEM

Compared with the 18×8 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 43.7 mm farther toward fender (more outward poke)
Inner edge 18.3 mm farther from suspension (more inner clearance)
Width +1" vs OEM

View full build on Modified1

22×?

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Tires: 265/35R22

Compared with OEM

Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +2" vs OEM

View full build on Modified1

22×?

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Tires: 305/40R22

Compared with OEM

Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +2" vs OEM

View full build on Modified1

20×?

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Tires: 285/50R20

Compared with OEM

Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

View full build on Modified1

Staggered · 22×? / Rear unknown

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Wheel: Driv Moonshines

Front: 22×? · 265/40R22
Rear: —

Compared with OEM

Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +2" vs OEM

View full build on Modified1

Staggered · 22×? / Rear unknown

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Wheel: U255

Front: 22×? · 305/40R22
Rear: —

Compared with OEM

Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +2" vs OEM

View full build on Modified1

20×?

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Tires: 275/45R20

Compared with OEM

Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

View full build on Modified1

24×?

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Tires: 275/25R24

Compared with OEM

Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +4" vs OEM

View full build on Modified1

Staggered · 24×10 / Rear unknown

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Wheel: DUB

Front: 24×10 · 295/30R24
Rear: —

Compared with OEM

Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +4" vs OEM

View full build on Modified1

22×?

Documented on a 2008 Chevrolet Silverado 1500 build — observed custom fitment, not a universal fit guarantee.

Tires: 265/35R22

Compared with OEM

Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.

Diameter +2" vs OEM

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 2008 Chevrolet Silverado 1500

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.