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Wheel fitting terms and concepts :: Articles about Tire industry. Professional Tire Tests and Special Reports Learn about types of tires, size, speed rating, tread wear, and other factors to consider when replacing or upgrading your car's tires.

Offset

Offset
Centre Bore

Centre Bore

The centre bore is the size of the hole in the centre of the wheel where the spigot fits through.  The centre bore, (also known as spigot s…
Bolt Pattern/Pitch Circle Diameter (PCD)

Bolt Pattern/Pitch Circle Diameter (PCD)

PCD (Pitch Circle Diameter) is the measurement of the diameter of the imaginary circle drawn through all of the wheel bolts or studs on a w…
What are hub centric rings?

What are hub centric rings?
Bolt pattern in metric or inches

Bolt pattern in metric or inches

Today we're going to talk about bolt pattern in metric and inches,(or should we say bolt pattern, same thing though).