SRAM NX Eagle DUB Boost 170mm 32t Set w/ Cassette, Shifter, Derailleur, ChainSRAM NX Eagle DUB Boost 170mm 32t Set w Cassette, Shifter, Derailleur, Chain The NX Eagle crankset delivers Eagle styling and performance to the newest addition of the Eagle ecosystem. DUB technology features a better engineered bottom bracket and a new spindle design, which together allows for a more uniform approach to bottom bracket fitment, better sealing against contamination and forward and backward compatibility. Designed for SRAM's X Sync 2