it's referring to forwards from core center, the point that is the recomended mounting point, where the core is thihckest, the sidecut is skinniest and the ski is built to be mounted at.Â
it makes mroe sense to talk about mounting back from true center when talking about newschool ski mounting points...Â
I.E. my made'ns are mounted +5.5 from core center, -4 from true center. I like them there.Â
the recomendedmounting point varies with each ski which is why it makes more sense to talk about back from true center.