[Marco Tahtaras]

Originally Posted by Jerry Parr WI

The toe in spec is given at hub level or the center of the wheel. The gauge indications are intended to compensate for the fact that you are not measuring at the center of the wheel so they are not ruler measurements. Changing the chain length would also affect that compensation. The shorter the chains the more compensation necessary. At true wheel center no compensation is necessary so ruler measurements would apply.

The problem with attempting to compensate AS IF you were setting at the center of the wheel is that you would need various chains for different wheel/tire sizes based on the outside diameter.

Below is pic of the tag from my original gauge. Have you seen an original done differently?