To me there can't be a rigid answer as there is no way to head off from a point on the globe going east and arrive back from the west having crossed the equator twice using a bike.
I think to claim RTW you should have ridden on at least three continents, gone roughly east to west or west to eat, crossed the equator and international date line (you have to fly that one to be practical) and ridden more miles than you flew, but who am I to say what is or isn't.
Andy
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