1991 GMC Syclone tire and wheel sizes, bolt pattern and tire pressure

Bolt pattern 5x120.65 on every 1991 trim.

Tires for the 1991 GMC Syclone

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

245/50R16 Best-rated standard on 1 trim

Check price on Amazon · 245/50R16
255/45R17 Best-rated optional on 1 trim

Check price on Amazon · 255/45R17
255/45R17 front + 285/40R17 rear Best-rated optional on 1 trim

Check price on Amazon · 255/45R17 front Check price on Amazon · 285/40R17 rear

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Trims sold in 1991: 1
Generation: GMT300
Other years: 1991
1992
All years (1991–1992)

1 trim sold in 1991

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

GMC Syclone GMT300

1991–1992 1 trim

Syclone 4.3T 280 hp · V6 245/50R16 97V / 245/50R16 97V 3 fitments

Generation: GMT300 · 1991–1992
Power: 280 hp
Engine: V6, Petrol
Center bore: 70.3 mm
Bolt pattern: 5x120.65
Thread: M12 x 1.5

Check price on Amazon · 245/50R16 Check price on Amazon · 245/50R16 Wheels 16x8 ET41 · 5x120.65 · 70.3 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
Front245/50R16 97V	Rim 16x8 ET41 ~~5x120.65~~	35 psi
Rear245/50R16 97V	Rim 16x8 ET13 ~~5x120.65~~	35 psi
Front255/45R17 95W	Rim 17x8.5 ET45 ~~5x120.65~~	38 psi
Rear255/45R17 95W	Rim 17x8.5 ET15 ~~5x120.65~~	38 psi
Front255/45R17 95W	Rim 17x8.5 ET45 ~~5x120.65~~	38 psi
Rear285/40R17 97W	Rim 17x9.5 ET35 ~~5x120.65~~	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). ET41 is the wheel offset: how far the mounting face sits from the rim centre, in millimetres. Compare offsets in the wheel offset calculator.

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.