ITA Shimano Bottom Bracket is designed for road bikes with Italian threading, which originates from British Standard Cycle and is equivalent to BSA threading. This kit is compatible with 24mm diameter thru-axle cranks, commonly used by major brands like Shimano, FSA, and Rotor. Choose from two options for the cups: Standard Bearings with low drag from hardened-steel races and Ceramic balls, or Coated Bearings with longer life and reduced bearing drag from coated, hardened-steel races.