If you are running our Riff Raff or Zig Zag skis, we HIGHLY RECOMMEND that you orient the knucklehead tower (the big block looking thing that attaches the front ski to the fork) so that the angled side is facing forward and the flat side is facing backward. For detailed information and instructions on how to do this, please check out the “Turning the knucklehead around” on our “How To” videos for Lenz Skibikes.