1978 Oldsmobile Omega tire and wheel sizes, bolt pattern and tire pressure

Check the tables below for every tire size, wheel size, bolt pattern (PCD), rim offset and tire pressure fitted to the 1978 Oldsmobile Omega.

1978 Oldsmobile Omega tire sizes

195/75RS14

Bolt pattern

5x120.65

Other years

1974 1975 1976 1977 1978 1979 1980 1981 All 1973–1984

Fitment tables

4 trims sold in 1978

Open a trim for its factory package and every alternative size, front and rear.

Oldsmobile Omega II X-body

1975 – 1979 USA market 4 trims

Omega 3.8

110 hp · V6 195/75 SR14 1 fitment

GenerationII X-body 1975–1979

Power110 hp

EngineV6, Petrol

Center bore70.3 mm

PCD5x120.65

Thread7/16" - 20 UNF

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
195/75 SR14	14x6 ET0 ~~5x120.65~~	–	Tires Rims

Omega 4.1

115 hp · I6 195/75 SR14 1 fitment

GenerationII X-body 1975–1979

Power115 hp

EngineI6, Petrol

Center bore70.3 mm

PCD5x120.65

Thread7/16" - 20 UNF

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
195/75 SR14	14x6 ET0 ~~5x120.65~~	–	Tires Rims

Omega 4.3

105 hp · LV8 V6 195/75 SR14 1 fitment

GenerationII X-body 1975–1979

Power105 hp

EngineLV8 V6, Petrol

Center bore70.3 mm

PCD5x120.65

Thread7/16" - 20 UNF

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
195/75 SR14	14x6 ET0 ~~5x120.65~~	–	Tires Rims

Omega 5.7

160 hp · V8 195/75 SR14 1 fitment

GenerationII X-body 1975–1979

Power160 hp

EngineV8, Petrol

Center bore70.3 mm

PCD5x120.65

Thread7/16" - 20 UNF

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
195/75 SR14	14x6 ET0 ~~5x120.65~~	–	Tires Rims

Reading the table

What these columns mean

OE fitment: The package fitted at the factory for that trim.
Alternative: A size the car accepts without modification — plus-sizing, winter setups or optional wheels.
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.