The Box One Stealth MTB Boost Rear Hub is the ultimate MTB hub and offers instant engagement, silent, low-drag coasting, and excellent sealing from the elementsGerman made unique one-way roller clutch bearing is completely silent, offers unlimited points of engagement and presents minimal frictionAngled hub flanges improve spoke bracing, decreases spoke breakage and promotes stronger overall wheelsOptimized use of application specific Enduro bearings for long life and unmatched performance 7075 aluminum body and steel driver Boost spacing and 6 bolt disc brake compatibleRR11-12s XD32H12TAAlyBlk500g6B148UPC/EAN/GTIN: 639266097938