The Shimano 4600 Tiagra bottom bracket includes the cups and bearings needed to install a Hollowtech 2 road crankset such as the FC-4600. Available in standard BSA threading (68mm BB shell).

• B00BD8KEQI
• Park Tool Bottom Bracket Tool - Hollowtech II - BBT-9
• Shimano Hollowtech-II crank-arm/cap tool, TL-FC16
• Shimano CN-HG53 9-speed Bicycle Chain
• B00BD9LU8S