Syncros SCT Boost Rear Hub - 28 Hole - SRAM XD Driver - 6 Bolt Disc - BlueSyncros SCT Boost Rear Hub 28 Hole SRAM XD Driver 6 Bolt Disc Blue An exceptional value, versatile and easily serviceable rear hub set from Syncros . It's precision build and quality engineering makes it a bullet proof high quality hub that guarantees a smooth ride time and time again. It utilises a 4 pawl ratchet system with points of engagement and is set up with 12 x 148mm spacing. Available in a striking anodised blue this hub really offers you