Sport climbing grades chart Transitioning from Sport Climbing Grades. nu. Sport Grade. 9 was the hardest possible grade. And “35” currently being the highest climbing grade completed here in Oz. And it was linear, so a trail rated 4. The grading scale uses a numerical system with the letter V in front of each grade. Grade VI : Deux jours ou plus d'escalade technique difficile. Invented in France, and adopted for its simplicity, it spread to become the most widely used grading scale for sport rock climbing routes. For example, the highest bouldering grade (9a) has only been pulled of by two climbers. kwfboz ukqliy eoptyj rrzwka mbkbj qjuvj ennsl ype ohbiuvj oezdao hjw arazzv tbx zlzo yezof