About the Shimano 105 Ocktalink 110mm 68Shell Bott Bracket
Sealed cartridge bottom bracket suitable for use with all cranks using the Octalink system which includes Shimano Sora, Tiagra and 9 speed 105, Ultegra and Dura-Ace.
The BB-5500 replaces the ES-50 series and is interchangeable in all cases