`- For use with standard Road triple cranks, but optimized for cranks with smaller rings such as 48/36/24t or 50/36/26t \n- Braze-on fits frames with pre existing front derailleur braze-on or 28.6, 31.8mm or 34.9mm braze-on/band-clamp adapters\n- Choose Alpina-D for drop bars or Alpina-F for flat bars