1978 GMC Jimmy K5 tire and wheel sizes, bolt pattern and tire pressure

Bolt pattern 6x139.7 on every 1978 trim.

Tires for the 1978 GMC Jimmy K5

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

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

1973–1991 1 trim

Jimmy K5 4WD N/A 235/75R15 1 fitment

Check price on Amazon · 235/75R15 Wheels 15x7 ET12 · 6x139.7 · 78.3 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
235/75R15	Rim 15x7 ET12 6x139.7	–

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.