The profile of the teeth is designed with Ultra-Drive™ geometry which facilitates the passage of the chain on the sprockets and makes shifting precise, fast and silent. 
Heat treated cogs are carefully machined from nickel chrome steel
All of these cogs have a hardened chrome, satin silver finish for longer wear
Each cog has an indented ramp, called Ultra Drive (UD), to assist in up shifting
Tooth profiles are also custom configured to help with down shifting.
Weight: 250gr
12-25