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

Check the tables below for every tire size, wheel size, bolt pattern (PCD), rim offset and tire pressure fitted to the 2008 Pontiac Grand Prix GXP.

2008 Pontiac Grand Prix GXP tire sizes

Bolt pattern

Other years

Fitment tables

Open a trim for its factory package and every alternative size, front and rear.

2005 – 2008 USA market 1 trim

303 hp · V8 255/45 R18 97V / 225/50 R18 95V 2 fitments

GenerationW-body 2005–2008

Power303 hp

EngineV8, Petrol

Center bore70.3 mm

PCD5x115

ThreadM12 x 1.5

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
Front255/45 R18 97V	18x8 ET40 ~~5x115~~	38	Tires Rims
Rear225/50 R18 95V	18x7 ET55 ~~5x115~~	35	Tires Rims
Front265/40 ZR19 96W	19x8.5 ET40 ~~5x115~~	39	Tires Rims
Rear235/45 ZR19 94W	19x7.5 ET55 ~~5x115~~	36	Tires Rims

Reading the table

OE fitment: The package fitted at the factory for that trim.
Alternative: A size the car accepts without modification — plus-sizing, winter setups or optional wheels.
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.
Staggered: A wider tire on the rear axle than the front. Front-to-back rotation is not possible.
Thread size: Lug bolt or nut thread — needed when buying aftermarket fasteners.