Originally Posted by
Polaris OBark
Mine are set up quite stiff, so no bob. It definitely helps, although I could live without them. The tires help more.
There is a mechanical engineering paper, which can be found via Google, that studied the dampening ability of this stem and concluded it was the equivalent of reducing tire pressure on a road bike tire from 110 to 75 psi. Pretty amazing in my opinion. I think I'm going to pick one up before my next tour.