I needed this tool, so I made it and thought I'd share.

This tool is for measuring the theoretical backspacing of a wheel before you purchase it. This enables you to know the limitations before purchasing the wheels.

It works on:

8X197 (ford 1 ton)

8X6.5 (chevy 1 ton)

6X139.7 (many toyota 6 lugs)

Quick tips:

The listed wheel size is NOT what you set the wheel to. Set it to the inside diameter of the rim.

The stick tool measures relative to the tip and the edge closest to the brake rotor.

Ensure the stick is perpendicular to the main tool at all times.

Have fun and good luck!