1976 GMC Suburban 1500 tire and wheel sizes, bolt pattern and tire pressure

Bolt patterns 5x127 or 6x139.7, depending on the market version.

Tires for the 1976 GMC Suburban 1500

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

205/75R15 Best-rated standard on 3 trims

Check price on Amazon · 205/75R15
235/75R15 Best-rated standard on 3 trims

Check price on Amazon · 235/75R15

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Trims sold in 1976: 6
Generation: C/K series
Other years: 1973
1974
1975
1976
1977
1978
1979
1980
All years (1973–2006)

6 trims sold in 1976

Open a trim for its tire and rim sizes, bolt pattern and tire pressure. Trims with the same tires and wheels share a row.

GMC Suburban 1500 C/K series

1973–1991 6 trims

Suburban 1500 5.7 +2 variants N/A · V8 205/75R15 105S 1 fitment

Same tires and wheels on: 5.7D, 6.6

Generation: C/K series · 1973–1991
Power: N/A
Engine: V8, Petrol
Center bore: 78.3 mm
Bolt pattern: 5x127
Thread: 1/2" - 20 UNF

Check price on Amazon · 205/75R15 Wheels 15x6 ET25 · 5x127 · 78.3 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
205/75R15 105S	Rim 15x6 ET25 5x127	35 psi

How to read 105S: 105 is the load index (up to 2,039 lb / 925 kg per tire) and S the speed rating (up to 112 mph / 180 km/h). ET25 is the wheel offset: how far the mounting face sits from the rim centre, in millimetres. Compare offsets in the wheel offset calculator.

Suburban 1500 5.7 4x4 +2 variants N/A · V8 235/75R15 112S 1 fitment

Same tires and wheels on: 5.7D 4x4, 6.6 4x4

Generation: C/K series · 1973–1991
Power: N/A
Engine: V8, Petrol
Center bore: 108 mm
Bolt pattern: 6x139.7
Thread: 7/16" - 20 UNF

Check price on Amazon · 235/75R15 Wheels 15x7 ET25 · 6x139.7 · 108 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
235/75R15 112S	Rim 15x7 ET25 6x139.7	35 psi

How to read 112S: 112 is the load index (up to 2,469 lb / 1,120 kg per tire) and S the speed rating (up to 112 mph / 180 km/h). ET25 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.