The NX Eagle PG-1230 cassette gives riders every bit of the climbing range that the Eagle ecosystem affords with a simple upgrade to splined-drive body wheels. Designed to be durable enough to withstand the increased demands of E-MTB applications and a perfect solution to heavy-duty use and abuse.Eagle technology provides an expanded, optimum, gear range making you fast on the flats, giving you control on the climbs and unleashing your speed on the descents. The PG-1230 is the only Eagle cassette that meets durability requirements for E-MTB applications. Wide 11-50t gear range - Compatible with a splined driver body. Designed to be used with Eagle 12-speed chains. Item Specifications: Cassette Body Type, /SRAM 8, 9, 10 Speed, Dynasys 11 Speed Mountain, Cassette Cogs,.