Designed for aggressive riders who hold nothing back, the Industry Nine Hydra Enduro 300 27. 5in Boost Wheelset is made for smashing through rock gardens and down technical trails at Mach speed. The Enduro 300 27. 5in Boost Wheelset is a premium quality aluminum alloy wheelset that has a unique triple-cavity rim that features Hollow Bead Wall technology for increased impact and pinch flat resistance. Combined with Industry Nine's top-tier Hydra hubs, the Enduro 300 27. 5in wheelset gives us near-instant engagement, with the Hydra hubs harnessing 690 points of engagement for super-quick power to the pedals in technical sections.