CS-HG81-10 10-Speed Cassette Cog -11t Built In Spacer Type For bj/bk-Group

This is the Shimano CS-HG81-10 10-speed cassette cog with an 11t built-in spacer type, designed for the bj/bk-group. It serves as a great replacement cog for Shimano CS-M8100 12-speed cassettes. With 11 teeth and a drivetrain of 10 speeds, it's made of high-quality steel for reliable performance.

Using this Shimano cassette cog is easy. Just install it properly on your bike's drivetrain that fits the bj/bk-group. Make sure to check the compatibility before installation. When using, avoid excessive force on the pedals under high loads to prevent damage. For maintenance, clean it regularly with a mild cleaner and a soft brush to remove dirt and debris. Also, lubricate the moving parts to keep it running smoothly. If you notice any abnormal noises or difficulties in shifting, have it checked by a professional bike mechanic.