Well it's a lot easier to call them front & rear facing dropouts or axle slots because most people understand that ( it's all I have heard them called all my life! ), If I called them rear fork slots I'd spend most of my time trying to edgamacate everyone what I'm talking about, when it comes to bicycles/motorcycles most people know a fork as the thing that the handlebars turns to steer front wheel.try using some of the technical terms about cars, computers etc. and see the blank stares you get. when is the last time you heard ck out that saddle! unless your riding a horse. shortcut terminology everywhere. Don't got the time to worry about all this, but one thing bugs me is when I hear "skip ah tooth"