Get ready to ride anywhere with the SRAM wide-range PG-1230, 11- to 50-tooth Eagle™ cassette. The NX cassette gives riders every bit of the climbing range that the Eagle™ ecosystem affords with a simple upgrade to splined-drive body wheels. The PG-1230 is the only Eagle™ cassette designed to be durable enough to withstand the increased demands of E-MTB applications and a perfect solution to heavy-duty use and abuse. PowerGlide II Cassette technology optimized for off-road. More reliable. More durable. Better performing thanks to an optimal tooth profile and shift ramp design for quick and positive index shifting.