Just got spoke to by a Maxxis employee who said I've been given the 60A. Not impressed at all, was convinced this was the case before as you can really feel the difference just from squeezing the tread. It also feels less 'sticky'.
I just hate the whole premise of 60A. Trading grip for anything just doesn't cut it for me. Rolling resistance and life are far less important than me being able to actually corner without sliding out under heavy compressions.
Maxxis are always a little on the heavy side. But the sidewall is noticeably thicker, and there is no soft section on these where the sidewall starts to become the outer tread like on the Muddy Mary's.