Groupset Shimano Tiagra 9 Spd Triple Groupset Bottom Bracket Shimano 4500 BB Cups (34/4500 double/triple) Eng Brakes Shimano Tiagra 4500 Brakes Cassette Shimano 9 Spd HG50 (Sora/Tiagra) Cassette 12-25 Chain Shimano 9 Spd HG53 Chain (Sora/Tiagra 9/Deore) Chainset Shimano Tiagra Triple 4503 9 Spd Chainset 170 30/39/50 Front Gear Shimano Tiagra 4503 9 Triple Front Gear Braze-on Rear Gear Shimano Tiagra 4500 9 Spd Rear Gear Medium Gearshift Sti/Ergo Shimano STI Levers Tiagra 4503 with Cables Triple