Shimano CS-M9100 12-Speed Cassette Cog Unit - 10t (B) and 12t (D)

Shimano CS-M9100 12-Speed Cassette Cog Unit - 10t (B) and 12t (D). These genuine Shimano replacement cogs are designed specifically for the CS-M9100 12-Speed cassette, ensuring precise shifting performance and reliable durability. Ideal for repairing or upgrading your drivetrain, these steel cogs provide consistent engagement and long-lasting wear resistance, helping maintain optimal bike efficiency.