I have no clue what the tooth count is. I believe the big ring is 52 and the small is 24, it's a mountain package. The cogset goes under 1-to-1 so there must a 28 back there.
This is getting off the topic but I'll continue to explain what I mean by little difference. I don't feel it and that's really all I care about. Mathematically there may significant change. Well, let me rephrase that without going back and erasing stuff. My practice hill outside of Boise is 4,000 feet in 16 miles. I'm in the center ring and the largest cog for 70% of the climb. There are a few steep pitches that I don't mess with anymore and I just drop into the granny ring and the largest or next one or two cogs. The bottom end of the gear set, those three cogs on the granny ring, are, of course, the only useable gears. The other six cogs/granny are all repeated in the middle ring's range, which, of course, overlaps considerably with the large ring's range. A 27-speed transmission only has about 15 distinct gear ratios with overlap and a few incrementals. I've got the shifting pattern memorized and don't think about the fancy front/rear combinations that allow a smooth, tooth by tooth progression from ultragranny to tallest.
Sorry for misstating my point the first time around. I still say there's no magic cogset, only competent shifting.