Not sure about tyres on stan's rims, sorry, but I will throw in a couple fo observations.
I use conti MKs 2.4s back and front, and also RR 2.4s when dry out.
RRs are, as others have said, massive. They are also pretty light (I have folding), and this is a pretty noticeable difference compared to MKs. You can really feel the reduction in rolling mass when you are fighting to get up something tiring. I have also found that RRs wash out pretty damn quickly in loose dry corners. It is predictable, but they are deffo lacking in grip.
MKs feel heavier (perhaps both drag and weight), but for my riding they offer very good grip and shed mud nae bother at all. My riding is mostly forest.
They do wear pretty fast on the rear however.
Kev