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MrBaklava-
you need a bb to fit in a system six, which likely has a bb30 shell (I think), not the threaded variety like that standard bb.
bb30 options are to use a one piece unit such as rotor or praxis which will allow you to run shimano cranks, or run a proper bb30 with adapters.
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one of these might do it
Philip_J_Fry
rive_gauche
Shimano BB wrench, and no.