i have the 181's -2.5 back and they are great for everything from groomers to rails and jumps... when im on the groomers i feel like they are mounted for all mountain and when im landing switch and spinning in the park they feel like ther center mounted. i do haveta lean back a lil when i hit some powder but then they are fine. thers actually a mark on the ski for -2.5 so the tech wont screw up the mounting