The Shimano CS-HG31-8 cassette is an 8-speed cassette that is compatible with Shimano bodies. This cassette has a gear ratio of 11-32 and is made of steel. With the Shimano HG31 cassette you can shift smoothly and enjoy an optimal cycling experience. The cassette is gray in color and has a primary base color. Shimano is a world-renowned brand in the bicycle industry and is known for its quality and innovation. With the Shimano CS-HG31-8 cassette you are assured of reliability and durability. Product specifications - Brand: Shimano - Shimano group: Altus - Shimano group code: HG31 - Shimano model code: CSHG31 - Model year: 2010 - Number of gears: 8 - Shimano type: HG - Gear ratio: 11-32 - Material: Steel - Type: HG 31 - Primary base color: Gray