Why? SMP on my lauf anywhere... If you've ever rode an SMP you know how much leverage the saddle can create and riding bumpy terrain your saddle is likely to slip. I'm shying away from 2 bolt designs as most (especially the light ones) don't offer an even clamping area top/bottom as SMP specifies to avoid kinking the rails.
Some of the options:
outdated 3T posts with the diff-lock mechanism
Easton new ISA posts ( not that light)
