Designed as the ultimate trail bike wheelset, the Reserve 30 HD MX i9 1/1 29/27. 5in Boost Wheelset is a top-tier carbon wheelset that gives us uncompromising performance. These rims are made from premium carbon fiber and built and tested to the highest standards to ensure a top-quality product. The 30 HD rims have a redesigned rim profile which includes offset spoke holes for easier tubeless installation. External reinforcements around the spokes offer additional durability, and an asymmetrical design makes for a stiffer, stronger, and more reliable wheel. These rims are paired with Industry Nine's 1/1 hub, which features 90 points of engagement for race-worthy performance. This wheelset is a mixed-wheel configuration, giving us a 29-inch wheel up front and a 27. 5-inch wheel in the rear.