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1974 GMC Suburban 1500 tire and wheel sizes, bolt pattern and tire pressure

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

Tires for the 1974 GMC Suburban 1500

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

  1. 205/75R15 Best-rated standard on 6 trims
    Check price on Amazon · 205/75R15
  2. 235/75R15 Best-rated standard on 6 trims
    Check price on Amazon · 235/75R15

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Trims sold in 1974
12
Generation
C/K series

12 trims sold in 1974

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 12 trims

Market not listed

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 sizeRim size and bolt patternPressure, psi
205/75R15 105SRim 15x6 ET25 5x12735 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. Check a new wheel against the factory 15x6 ET25 in the offset and backspacing 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 sizeRim size and bolt patternPressure, psi
235/75R15 112SRim 15x7 ET25 6x139.735 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.

USA

6 trims
Suburban 1500 5.7 (Closed Off-Road Vehicle) +2 variants V8 Petrol V8 205/75SR15 1 fitment

Same tires and wheels on: 5.7D (Closed Off-Road Vehicle), 6.6 (Closed Off-Road Vehicle)

Generation
C/K series · 1973–1991
Market
USA
Engine
V8 Petrol V8, Petrol
Center bore
78.3 mm
Bolt pattern
5x127
Check price on Amazon · 205/75R15 Wheels 15x6 ET25 · 5x127 · 78.3 mm on Amazon
Tire sizeRim size and bolt patternPressure, psi
205/75SR15Rim 15x6 ET25 5x12735 psi
Suburban 1500 5.7 4x4 (Closed Off-Road Vehicle) +2 variants V8 Petrol V8 235/75SR15 1 fitment

Same tires and wheels on: 5.7D 4x4 (Closed Off-Road Vehicle), 6.6 4x4 (Closed Off-Road Vehicle)

Generation
C/K series · 1973–1991
Market
USA
Engine
V8 Petrol V8, Petrol
Center bore
108.1 mm
Bolt pattern
6x139.7
Check price on Amazon · 235/75R15 Wheels 15x7 ET25 · 6x139.7 · 108.1 mm on Amazon
Tire sizeRim size and bolt patternPressure, psi
235/75SR15Rim 15x7 ET25 6x139.735 psi
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.
Trims sold in 1974
12
Generation
C/K series
Other years
All years (1973–2006)

Considering a different size?

Compare your current tire size with the one you want: diameter change, ground clearance and speedometer error.

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