The T47 E.B. bottom bracket is for installing a Shimano Hollowtech II crank into a T47 frame External Bearing frame, use for a 68mm Road frame and 68/73mm Mountain frames.
. For Shimano Hollowtech II cranks only
. 7075 T6 AL cups/T47 External Bearing
. 68mm Road version
. 68/73mm MTB setup
Tool Used
. Use any standard outboard cup BB tool with 16 external notches and a 44mm ID