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

Genuine Shimano replacement cogs for the CS-M9100 12-speed cassette system. These individual cog units—the 10-tooth (B) and 12-tooth (D)—are designed for repair or replacement, helping you restore your drivetrain's shifting performance without replacing the entire cassette.

• Compatible with Shimano CS-M9100 12-speed cassettes
• Includes the 10t (B) and 12t (D) cog units as specified
• Genuine Shimano parts for reliable, consistent performance
• Ideal for servicing worn cogs or as spares for maintenance
• Simple, direct replacement for your existing cassette cogs