dude, the convex edge is every 6 inches, so i'm either dead center, to far forward or too far back. And i got to pick my skis off the factory floor and got two of them to match up. if you mail order them, you may be in for a surprize. just letting you know. when they say that they're "narrow ass snwoboards" its not because they're too cool be a ski company, its to cover their ass.