Hi,
I think there are 2 variants.
In an upright position (top of the bars) I sit mostly on the ischial tuberosities themselves.
In the drops or the aero bars, I have most of my weight forward, on the bony ledge (think it's called the os ischium) around your soft bits.
During a ride, I will move around, and i think that's part of the power of the SMP - the cupped shape offers you lots of different angles to sit.
I've tried to show in the below pic (cave: I'm not quite sure about the anatomy but I think I got it right) where I place my sit bones (red dot) and the ledges (green dot). The sit bones are quite way back (at least that's how I think I sit on it).
I don't know if the guy confused you more than is good.
I rode about 2500 km on it last year. Including a 190 end of season with NO significant pain during or after the ride.
As always:
Pictures of you on your bike would help in the discussion.



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