Originally Posted by
junkyard
I'm not sure I understand the purpose. So, the geometry changes somewhat when the fork compresses. I've never found that any slight change in geometry has caused any issues for my riding. I mean, when you come down to it, body position is ever changing when negotiating a trail. In essense, that is changing the geometry of your body relative to the frame as well. I don't see it as a necessary innovation.
But think of the radical change in geometry of an 8"-travel fork. Your effective axle-to-crown length changes so drastically on a hard compression. And that usually happens at moments when you could most benefit from the advantages of your frame's normally-slack angles.