1978 BMW 3 Series 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 BMW 3 Series.

1978 BMW 3 Series tire sizes

185/70R13

Bolt pattern

4x100

Other years

1975 1976 1977 1978 1979 1980 1981 1982 All 1975–2026

Fitment tables

6 trims sold in 1978

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

BMW 3 Series I (E21)

1975 – 1983 6 trims

3 Series 316

89 hp · M10B16 I4 185/70 R13 86H 1 fitment

GenerationI (E21) 1975–1983

MarketEurope

Power89 hp

EngineM10B16 I4, Petrol

Center bore57.1 mm

PCD4x100

ThreadM12 x 1.5

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
185/70 R13 86H	13x5.5 ET25 ~~4x100~~	28	Tires Rims

3 Series 318

97 hp · M10B18 I4 185/70 R13 86H 1 fitment

GenerationI (E21) 1975–1983

MarketEurope

Power97 hp

EngineM10B18 I4, Petrol

Center bore57.1 mm

PCD4x100

ThreadM12 x 1.5

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
185/70 R13 86H	13x5.5 ET25 ~~4x100~~	28	Tires Rims

3 Series 320

121 hp · M20B20 I6 185/70 R13 86H 1 fitment

GenerationI (E21) 1975–1983

MarketEurope

Power121 hp

EngineM20B20 I6, Petrol

Center bore57.1 mm

PCD4x100

ThreadM12 x 1.5

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
185/70 R13 86H	13x5.5 ET25 ~~4x100~~	28	Tires Rims

3 Series 320i

109 hp · 2.0L M10B20 I4 185/70 R13 1 fitment

GenerationI (E21) 1975–1983

MarketUSA

Power109 hp

Engine2.0L M10B20 I4, Petrol

Center bore57.1 mm

PCD4x100

ThreadM12 x 1.5

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
185/70 R13	13x5.5 ET25 ~~4x100~~	–	Tires Rims

3 Series 320i

123 hp · M10B20 I4 185/70 R13 86H 1 fitment

GenerationI (E21) 1975–1983

MarketEurope

Power123 hp

EngineM10B20 I4, Petrol

Center bore57.1 mm

PCD4x100

ThreadM12 x 1.5

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
185/70 R13 86H	13x5.5 ET25 ~~4x100~~	28	Tires Rims

3 Series 323i

141 hp · M20B23 I6 185/70 R13 86H 1 fitment

GenerationI (E21) 1975–1983

MarketEurope

Power141 hp

EngineM20B23 I6, Petrol

Center bore57.1 mm

PCD4x100

ThreadM12 x 1.5

Tire size	Rim size and bolt pattern	Pressure, psi	Prices
185/70 R13 86H	13x5.5 ET25 ~~4x100~~	28	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.