OEM Wheel designation

[Tomislav Marincic <TomAndKate@compuserve.com>]

        Listerati,

        Does anyone know what the significance of the
letters used in wheel designations is? For example, stock
TR250 wheels are stamped "4 1/2 J X15H". The manuals
list TR6 steel wheels as "5 1/2 J", but wires as "5 1/2 K".
What do the letters mean?

        On a related note, does anyone have the offset
of 5 1/2" Panasports or 5 1/2" K & N wheels handy? The
offset of my stock TR250 wheels seems to be 3/4" positive,
and I'd like to preserve that in the replacements.

        Tom Marincic
        CD3574L