The bolt pattern, also known as the lug pattern or bolt circle, makes up the diameter of an imaginary circle passing through the wheel lugs' centres. Bolt patterns found in Ford automobiles can be made of four, five, six, or eight bolt holes. A 5-x-115-mm bolt pattern, for example, would indicate five bolt holes, each 115mm apart. Dual bolt patterns have also been introduced, which enable wheels to fit two bolt patterns, such as 100 and 114mm.
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The size of the bolt pattern varies between Ford vehicles. The Aspire, for example, measured 13 x 4.5mm. The Escort available between 1981 and 1990 had a value of 13 x 5.5mm. The Crown Victoria, available from 1991 onward, measures 15 x 7mm, while the Mustang GT Cobra has a value of 17 X 8 mm.
Pitch Circle Diameter
The pitch circle diameter (PCD) of the bolt pattern in Ford automobiles also varies. The Aspire, for example, has four bolt holes, with a PCD of 4 x 100, while the Escort has four bolt holes with a PCD of 4 x 108. The Crown Victoria has five bolt holes and a PCD value of 5 X 114.3, while the Courier Pickup has a six bolt holes with a PCD of 6 X 139.7.
Lug sizes are relatively the same between Ford automobiles. A lug size of 12 x 1.5mm is standard in most models, including the Escort, Focus, Mustang, Tempo, T-Bird, Taurus and Aerostar.
The centre bore in the bolt patterns of Ford automobiles varies from 54.1 to 87. The Aspire, for example, has a centre bore of 54.1, while the Escort is 63.9. The larger Expedition and F-150 have a centre bore of 87.
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