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JesperXT
umop3pisdn
Where are you getting that number? I have Alfine on the tandem, and they seem to be the same 147mm ish as the Tiagra cranks they are based on.
EDIT: Calipers deployed - I'm getting ~154mm for the FC-S500 single guard type, I think from the EV the double guard type should be +6mm on the Q