Here's how to measure the width for different parts of the wheel:

Place the wheel on a flat and stable surface with the outer lip facing upwards. This will make it easier to measure.

• Outer Rim: If you want to measure the width of the outer rim, use a measuring tape or calipers to measure the distance from one edge of the rim to the opposite edge. Make sure to measure in a straight line, perpendicular to the wheel's axis. Subtract 1/2 inch off the total width (due to bead edge). This will be your outer rim lip measurement.
• Inner Barrel: For the inner barrel, measure the width between the inner edges of the barrel using your measuring tape or calipers. Ensure the measurement is taken perpendicular to the wheel's axis.
• Center Disk: To measure the width of the center disk, you can measure from one side of the disk to the other, ensuring the measurement is perpendicular to the disk's surface.

1. Measure the Bolt Diameter:
   The diameter of a bolt is usually measured across the shank, which is the unthreaded portion of the bolt. To measure the diameter:
2. Measure the Bolt Length:
   To measure the length of the bolt, use a measuring tape or ruler. Measure from the underside of the bolt head to the tip of the bolt. Include the entire length of the threaded portion in your measurement. If the bolt has a washer or nut, don't include that in the measurement unless it is permanently attached.
3. Measure the Thread Pitch:
   The thread pitch is the distance between threads on the bolt. To measure it, you will need a thread pitch gauge:

Measure the Center Disc Width:

• Place the wheel on a flat surface.
• Use your Vernier caliper or micrometer to measure the width of the center disc. Make sure to measure from the inner edge of the center disc to the inner edge.

To measure the PCD (Pitch Circle Diameter) of a wheel, you will need a few tools and to follow some specific steps. The PCD is a crucial measurement that specifies the number of bolt holes on a wheel and the diameter of the imaginary circle that passes through the center of these bolt holes. It is essential to determine the correct PCD when selecting wheels or adapters to ensure they fit your vehicle. Here's how you can measure the PCD of a wheel:

Tools you will need:

1. A ruler or measuring tape.
2. A PCD gauge tool (optional but recommended for accuracy).

Steps to measure the PCD of a wheel:

1. Choose the Bolt Holes: The first step is to select any bolt hole on the wheel. You don't need to measure all of them; one bolt hole is sufficient.
2. Measure the Distance: Use your measuring tape or ruler to measure the distance from the center of the selected bolt hole to the center of an opposite or diagonally opposite bolt hole. Ensure that you measure from the center of the bolt holes, not from the edges.
3. Repeat the Measurement: To verify the accuracy of your measurement, repeat the process from another bolt hole to a diagonally opposite one. This helps reduce the risk of measurement errors.

1. Measure the Center Disc Width:

• Place the wheel on a flat surface.
• Use your Vernier caliper or micrometer to measure the width of the center disc. Make sure to measure from the outer edge of the center disc to the outer edge.