The shimano alivio cs hg400 9 speed cassette offers smooth and responsive shifting thatrsquos lightning fast to take your performance up a level this shimano mtb cassette features larger hollow spaces in the sprockets shedding an impressive 11 percent weight compared to previous models crafted from durable materials this cassette is able to withstand the brutalities of mtb and offers a superior stiffness for optimal power transfer the alivio hg400 when paired with the shimano hyperglide c