The GX Eagle derailleur features an updated cage architecture that improves chain managementBackwards compatible, works with both 10-50t and new 10-52t cassettesUpdated cage architecture provides better chain retention and precise shiftsComes in GX Eagle master colorway as part of Eagle Colorsystem and goes with all colors of Eagle cassettes & chains from Black to Gold to Rainbow, to HardChrome and new Copper12sp52Long1to1GRYEagleUPC/EAN/GTIN: 710845853487