Shimano CS-HG31 8-Speed Cassette Review Posted by GiantPandaisy July 7, 2018 in Drivetrain Components Precise and consistent HyperGlide shifting performance 8-Speeds Zinc Phosphate black finish 313 grams • Precise and consistent HyperGlide shifting performance• 8-Speeds• Zinc Phosphate black finish• 313 grams Brand: Shimano Cycling Outdoor Recreation Parts & Components SHIMANO Sports & Outdoors