Completely new rear derailleur incorporating Sram`s proven X-horizon design and new Type-3 Roller Bearing Clutch technology Eagle ecosystem-engineered mounting system and Cage Lock positioning add robustness Eagle pulley technology provides greater efficiency, crisper shifting and quieter operation The larger, 14-tooth X-Sunc lower pulley easily facilitates 11- to 50- and 10- to 50-tooth cassette capacity, and also adds to NX Eagle`s overall smooth-pedaling feel 12sp 50 Long 1to1 BLKUPC/EAN/GTIN: 710845818028