Skip to content
tirewheelguide.com

1978 Mercury Cougar 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 Mercury Cougar.

1978 Mercury Cougar tire sizes

220/78RS14205/75RS15225/70RS15205/70RS16225/65RS16
Bolt pattern
Other years
19741975197619771978197919801981 All 1967–2002
Fitment tables

3 trims sold in 1978

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

Mercury Cougar IV

1977 – 1979 USA market 3 trims

Cougar 4.9

134 hp · V8 205x SR14 6 fitments
GenerationIV 1977–1979
Power134 hp
EngineV8, Petrol
Center bore70.5 mm
PCD5x114.3
Thread1/2" - 20 UNF
Tire sizeRim size and bolt patternPressure, psiPrices
205x SR1414x6 ET10 5x114.3–TiresRims
220/78 SR1414x6.5 ET10 5x114.326TiresRims
205/75 SR1515x6 ET10 5x114.326TiresRims
225/70 SR1515x6.5 ET10 5x114.326TiresRims
205/70 SR1616x6 ET10 5x114.329TiresRims
225/65 SR1616x7 ET0 5x114.329TiresRims

Cougar 5.8

149 hp · V8 205x SR14 6 fitments
GenerationIV 1977–1979
Power149 hp
EngineV8, Petrol
Center bore70.5 mm
PCD5x114.3
Thread1/2" - 20 UNF
Tire sizeRim size and bolt patternPressure, psiPrices
205x SR1414x6 ET10 5x114.3–TiresRims
220/78 SR1414x6.5 ET10 5x114.326TiresRims
205/75 SR1515x6 ET10 5x114.326TiresRims
225/70 SR1515x6.5 ET10 5x114.326TiresRims
205/70 SR1616x6 ET10 5x114.329TiresRims
225/65 SR1616x7 ET0 5x114.329TiresRims

Cougar 6.6

173 hp · V8 205x SR14 6 fitments
GenerationIV 1977–1979
Power173 hp
EngineV8, Petrol
Center bore70.5 mm
PCD5x114.3
Thread1/2" - 20 UNF
Tire sizeRim size and bolt patternPressure, psiPrices
205x SR1414x6 ET10 5x114.3–TiresRims
220/78 SR1414x6.5 ET10 5x114.326TiresRims
205/75 SR1515x6 ET10 5x114.326TiresRims
225/70 SR1515x6.5 ET10 5x114.326TiresRims
205/70 SR1616x6 ET10 5x114.329TiresRims
225/65 SR1616x7 ET0 5x114.329TiresRims
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.

Considering a different size?

Run your OE size against the one you want to see diameter change, ground clearance and speedometer error.

Open the size calculator
Recent articles

Guides worth reading first

All articles
Basics

How to read a tire sidewall

Reading a tire sidewall is easy. Find out what the size, load index, speed rating and date code mean.

Continue reading
Guide

Everything you need to know about tire tread depth

Tire tread depth is an important factor in keeping your vehicle safe — how to measure it and when to replace.

Continue reading
Gear

Best supercapacitor jump starter review

We tested seven supercapacitor jump starters to find the ones worth buying.

Continue reading