so i currently have size 161 invaders(too small....), but anyways i tried out my friends 171 jibs for a run, and the jibs were lighter than my invaders by a lot, granted i have average weight bindings on my invaders, while  he has salomon z12s, but still i could tell a big difference.  Also everything else felt the same, except for the jibs were a tiny bit easier to turn on, and they were a bit stiffer, but i liked that