Devon, I made a gauge like this;
and I use it on all my wheels. I hold the gauge and rotate the axle so the gauge measures all the way around the wheels. That way I can also spot wonky wheels, where at 0 degrees they are in gauge, but at 180 degrees, WOW! Its simpler for me then setting up my caliper each time I work on a car. Its sitting on my workbench with my Kadee height gauge and ready to go at a moment’s notice.
Its from this website;
http://members.shaw.ca/sask.rail/construction/lsbuild/lstrack.html