Velocity Blunt SS Rimhe Blunt SS is the next evolution of our Blunt line of mountain disc rims. Specifically designed to be best in class for cross country use, the SS can be found atop race podiums and also on your pal's bike commuting to the trail. Light enough to win, tough enough to last. Shorter and thicker sidewalls for incredible durability even when paired with low pressure, tubeless tires. I beam bead hook maximizes internal width for optimum tire performance.