If you search the forum there is a good piece by Dave Turner re. sizing. General recommendatoin is if you are in between sizes err on the large.
I bought the medium coming from a medium SC Heckler. However the Turner just didn't feel right.
The problem with the medium is not the top tube but the head tube and, to a lesser extent, the seat tube. The short head tube means that, at 5'11" you will probably need a stack of spacers. You will also need a whole heap of seatpost to make it comfortable.
Of course much depends on body shape but I would say go with the large.
I am 5.11 and had a large 05 Spot with a 90mm stem - With a Medium I would have needed a 100 or 110mm stem and that wasn't going to happen given the techy rocky descents round here.....I think your selection depends on what stem lenght you prefer and the terrain you ride
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