2005 Cadillac STS-V tire and wheel sizes, bolt pattern and tire pressure

Bolt pattern 6x115 on every 2005 trim.

Tires for the 2005 Cadillac STS-V

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

255/45R18 front + 275/40R19 rear Best-rated standard on 1 trim

Check price on Amazon · 255/45R18 front Check price on Amazon · 275/40R19 rear
255/45R18 Best-rated optional on 1 trim

Check price on Amazon · 255/45R18
255/40R19 front + 275/40R19 rear Best-rated optional on 1 trim

Check price on Amazon · 255/40R19 front Check price on Amazon · 275/40R19 rear

Also listed: 255/40R19 + 285/35R20

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Trims sold in 2005: 1
Generation: GM Sigma
Other years: 2005
2006
2007
2008
2009
All years (2005–2009)

1 trim sold in 2005

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

Cadillac STS-V GM Sigma

2005–2009 1 trim

STS-V 4.4i 469 hp · LC3 V8 255/45R18 95Y / 275/40R19 100Y 4 fitments

Generation: GM Sigma · 2005–2009
Power: 469 hp
Engine: LC3 V8, Petrol
Center bore: 70.3 mm
Bolt pattern: 6x115
Thread: M12 x 1.5

Check price on Amazon · 255/45R18 Check price on Amazon · 275/40R19 Wheels 18x8.5 ET51 · 6x115 · 70.3 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
Front255/45R18 95Y	Rim 18x8.5 ET51 ~~6x115~~	30 psi
Rear275/40R19 100Y	Rim 19x9.5 ET56 ~~6x115~~	30 psi
Front255/40R19 95Y	Rim 19x8.5 ET51 ~~6x115~~	30 psi
Rear275/40R19 97Y	Rim 19x9.5 ET56 ~~6x115~~	33 psi
Front255/40R19 95Y	Rim 19x9 ET45 ~~6x115~~	32 psi
Rear285/35R20 97Y	Rim 20x10 ET45 ~~6x115~~	35 psi
255/45R18 95V	Rim 18x8 ET51 ~~6x115~~	30 psi

How to read 95Y: 95 is the load index (up to 1,521 lb / 690 kg per tire) and Y the speed rating (up to 186 mph / 300 km/h). ET51 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.
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.