The Shimano HG51 cassette is a high-quality 8-speed cassette. It's a reliable and durable part for your bike. With a gear ratio of 11-30T, this cassette offers a smooth and efficient circuit. The cassette is made of steel, which ensures a long service life. With the Shimano HG51 cassette, you're assured of optimum performance while cycling. Product specifications: - Brand: Shimano - Model: HG51 - Number of gears: 8 - Compatible body: Shimano - Gear ratio: 11-30 - Color: silver - Material: steel - Type: HG - Resistance: 11-30 - Cassette type: HG cassette - Suitable chain: 7/8 speed chain - Circuit type: hyper glide