![]() Pitch, Circular – It is the distance spanning over two adjoining holes along the circle of the pitch which is on a plane perpendicular to the axis of rotation. Pitch Circle – The pitch cylinder’s transverse section which is perpendicular to the axis is called a pitch circle. 3 studs indicates 3 holes, 4 holes are 4 studs, and so on. Stud – It is a piece of large metal that is pierced and projects from the surface, mostly as a decorative piece. This measurement is mostly theoretical, which makes it a bit difficult to visualise. The second part is defined as the diameter which is passed through all the bolt holes/wheel bolts/studs. Generally, this number varies from 4 to 6. It indicates how many holes are drilled into the wheel’s centre. ![]() ![]() The first part is pretty easy to comprehend. Pitch Circle Diameter, or PCD in short, has two measurements. ![]()
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