2008 Pontiac Grand Prix tire and wheel sizes, bolt pattern and tire pressure

Bolt pattern 5x115 on every 2008 trim.

Tires for the 2008 Pontiac Grand Prix

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

225/55R17 Best-rated standard on 1 trim · optional on 1

Check price on Amazon · 225/55R17
225/60R16 Best-rated standard on 1 trim

Check price on Amazon · 225/60R16
255/45R18 Best-rated standard on 1 trim

Check price on Amazon · 255/45R18

Also listed: 225/50R18 265/40R19

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Trims sold in 2008: 3
Generation: W-body III
Other years: 2001
2002
2003
2004
2005
2006
2007
2008
All years (1978–2008)

3 trims sold in 2008

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

Pontiac Grand Prix W-body III

2004–2008 3 trims

Grand Prix 3.8i GT 201 hp · V6 225/60R16 97S 2 fitments

Generation: W-body III · 2004–2008
Power: 201 hp
Engine: V6, Petrol
Center bore: 70.3 mm
Bolt pattern: 5x115
Thread: M12 x 1.5

Check price on Amazon · 225/60R16 Wheels 16x6.5 ET52 · 5x115 · 70.3 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
225/60R16 97S	Rim 16x6.5 ET52 ~~5x115~~	33 psi
225/55R17 95H	Rim 17x7 ET52 ~~5x115~~	35 psi

How to read 97S: 97 is the load index (up to 1,609 lb / 730 kg per tire) and S the speed rating (up to 112 mph / 180 km/h). ET52 is the wheel offset: how far the mounting face sits from the rim centre, in millimetres. Compare offsets in the wheel offset calculator.

Grand Prix 3.8i GTP 261 hp · V6 225/55R17 95V 2 fitments

Generation: W-body III · 2004–2008
Power: 261 hp
Engine: V6, Petrol
Center bore: 70.3 mm
Bolt pattern: 5x115
Thread: M12 x 1.5

Check price on Amazon · 225/55R17 Wheels 17x6.5 ET52 · 5x115 · 70.3 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
225/55R17 95V	Rim 17x6.5 ET52 ~~5x115~~	35 psi
225/50R18 94W	Rim 18x7 ET52 ~~5x115~~	35 psi

How to read 95V: 95 is the load index (up to 1,521 lb / 690 kg per tire) and V the speed rating (up to 149 mph / 240 km/h). ET52 is the wheel offset: how far the mounting face sits from the rim centre, in millimetres.

Grand Prix 5.3i GXP 303 hp · V8 255/45R18 97V 2 fitments

Generation: W-body III · 2004–2008
Power: 303 hp
Engine: V8, Petrol
Center bore: 70.3 mm
Bolt pattern: 5x115
Thread: M12 x 1.5

Check price on Amazon · 255/45R18 Wheels 18x7 ET55 · 5x115 · 70.3 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
255/45R18 97V	Rim 18x7 ET55 ~~5x115~~	38 psi
265/40R19 96W	Rim 19x7.5 ET55 ~~5x115~~	38 psi

How to read 97V: 97 is the load index (up to 1,609 lb / 730 kg per tire) and V the speed rating (up to 149 mph / 240 km/h). ET55 is the wheel offset: how far the mounting face sits from the rim centre, in millimetres.

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.