1999 Pontiac Grand Am tire and wheel sizes, bolt pattern and tire pressure

Bolt pattern 5x115 on every 1999 trim.

Tires for the 1999 Pontiac Grand Am

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

225/50R16 Best-rated standard on 1 trim · optional on 1

Check price on Amazon · 225/50R16
215/60R15 Best-rated standard on 1 trim

Check price on Amazon · 215/60R15
225/45R17 Best-rated optional on 1 trim

Check price on Amazon · 225/45R17

Also listed: 235/45R17 245/35R18

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Trims sold in 1999: 2
Generation: N-body
Other years: 1995
1996
1997
1998
1999
2000
2001
2002
All years (1972–2005)

2 trims sold in 1999

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

Pontiac Grand Am N-body

1985–1991 2 trims

Grand Am 2.4i 148 hp · I4 215/60R15 93S 3 fitments

Generation: N-body · 1985–1991
Power: 148 hp
Engine: I4, Petrol
Center bore: 70.3 mm
Bolt pattern: 5x115
Thread: M12 x 1.5

Check price on Amazon · 215/60R15 Wheels 15x6 ET42 · 5x115 · 70.3 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
215/60R15 93S	Rim 15x6 ET42 ~~5x115~~	30 psi
225/50R16 91H	Rim 16x6.5 ET42 ~~5x115~~	33 psi
225/45R17 91V	Rim 17x7 ET40 ~~5x115~~	36 psi

How to read 93S: 93 is the load index (up to 1,433 lb / 650 kg per tire) and S the speed rating (up to 112 mph / 180 km/h). ET42 is the wheel offset: how far the mounting face sits from the rim centre, in millimetres.

Grand Am 3.4i 174 hp · V6 225/50R16 91V 3 fitments

Generation: N-body · 1985–1991
Power: 174 hp
Engine: V6, Petrol
Center bore: 70.3 mm
Bolt pattern: 5x115
Thread: M12 x 1.5

Check price on Amazon · 225/50R16 Wheels 16x6.5 ET42 · 5x115 · 70.3 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
225/50R16 91V	Rim 16x6.5 ET42 ~~5x115~~	33 psi
235/45R17 91V	Rim 17x7.5 ET45 ~~5x115~~	36 psi
245/35R18 91W	Rim 18x8 ET45 ~~5x115~~	38 psi

How to read 91V: 91 is the load index (up to 1,356 lb / 615 kg per tire) and V the speed rating (up to 149 mph / 240 km/h). ET42 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.