Well that is certainly an interesting read. Looks like I will have to see if these would fit... my guess it's the Liteskin more than the extra width that did the trick. But not sure...
I just a had a quick peek at the clearance on mine with the big apple 2.0's mounted. I'd guess you could fit a 2.15 on the front, but I'm pretty doubtful about the rear. It's pretty close with the 2.0's. Of course, the width of the rim being used also affects actual tire width, so there might be a little fudge room there.