Riders want the derailleur to do its job shifting on command, whether under climbing load or the stage finish. The SRAM X01 Eagle derailleur gets it done with an updated cage architecture that improves chain management. Refined to work with the new 10-52t cassettes, it’s also backwards compatible for the 10-50t versions. Features Backwards compatible, works with both 10-50t and new 10-52t cassettes. Updated cage architecture provides better chain retention and precise shifts. Specifications Speed (RD): 12s Cable pull ratio: X-actuation Cage (RD): Long Max tooth: 52 Colour (RD): Lunar and Red Pulley bearings material: Steel Cage material (RD): Aluminium