What is my stitch size and how do I measure it?

The bolt pattern of the rims of your trailer (or trailer) or car consists of the number of bolt holes and the diameter of the bolt circle.

Number of bolt holes

The rim is attached by means of bolts. The number of bolt holes is used in the dimensions of the bolt pattern. These can easily be counted on the rim. The larger hub hole is not a bolt hole and therefore does not count for the bolt pattern. The hub hole is the middle hole in the centre of the rim. This fits around the axle.

Measure the diameter of the bolt circle

If you make a circle of the bolt holes you get the bolt circle. The diameter of this bolt circle is an essential data of the bolt gauge. You can measure the diameter of the bolt gauge yourself. The diameter of this circle in millimeters is used for the bolt gauge.

4 or 6 bolt holes

For a rim with 4 or 6 bolt holes, you can measure the distance of two opposite bolt holes from center to center, this is the bolt circle diameter. A common size is 4x100. This means that 2 opposite bolt holes are 100 mm apart center-to-center. The bolt circle diameter is therefore 100 mm.

5 bolt holes

With a rim with 5 bolt holes it is a bit more complicated. This can be done in two ways:

• The first way is to draw an imaginary circle through the centers of the bolt holes and measure the diameter of this circle.
  
  
• The second method uses two opposite bolt holes, just like with 4 and 6 bolt holes. However, you do not measure from center to center, but from the outside of one bolt hole to the center of the opposite bolt hole.

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