I always thought it was called Ultegra when it switched from the silver 600 EX SIS to the great dark grey color and the term "Tri Color" was applied as sort of nickname to separate it from EX.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk