2008 Pontiac G8 tire and wheel sizes, bolt pattern and tire pressure

Bolt pattern 5x120 on every 2008 trim.

Tires for the 2008 Pontiac G8

Sizes most trims come with first. Open your trim below for its exact size.

245/45R18 Best-rated standard on 2 trims

Check price on Amazon · 245/45R18
245/40R19 Best-rated optional on 2 trims

Check price on Amazon · 245/40R19

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Trims sold in 2008: 2
Generation: I
Other years: 2008
2009
All years (2008–2009)

2 trims sold in 2008

Open a trim for its tire and rim sizes, bolt pattern and tire pressure.

Pontiac G8 I

2008–2009 2 trims

G8 3.6i 256 hp · 3.6L LY7 V6 245/45R18 96V 2 fitments

Generation: I · 2008–2009
Power: 256 hp
Engine: 3.6L LY7 V6, Petrol
Center bore: 66.9 mm
Bolt pattern: 5x120
Thread: M14 x 1.5

Check price on Amazon · 245/45R18 Wheels 18x8 ET48 · 5x120 · 66.9 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
245/45R18 96V	Rim 18x8 ET48 5x120	35 psi
245/40R19 95W	Rim 19x8 ET48 5x120	36 psi

How to read 96V: 96 is the load index (up to 1,565 lb / 710 kg per tire) and V the speed rating (up to 149 mph / 240 km/h). ET48 is the wheel offset: how far the mounting face sits from the rim centre, in millimetres. Compare offsets in the wheel offset calculator.

G8 6.0i GT 361 hp · 6.0L L76 V8 245/45R18 96V 2 fitments

Generation: I · 2008–2009
Power: 361 hp
Engine: 6.0L L76 V8, Petrol
Center bore: 66.9 mm
Bolt pattern: 5x120
Thread: M14 x 1.5

Check price on Amazon · 245/45R18 Wheels 18x8 ET48 · 5x120 · 66.9 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
245/45R18 96V	Rim 18x8 ET48 5x120	35 psi
245/40R19 94W	Rim 19x8 ET48 5x120	36 psi

What these columns mean

Rim size: Rim diameter × width in inches, and the factory offset (ET) in millimetres, e.g. 18x7.5 ET25.
Bolt pattern (PCD): Number of studs and the diameter of the circle they sit on. It must match exactly.
Center bore: Diameter of the hub hole. Larger aftermarket bores need hub-centric rings.
Pressure: Recommended cold inflation pressure for that axle, in psi.
Thread size: Lug bolt or nut thread — needed when buying aftermarket fasteners.