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I'd go for Alfine, even though the Q factor is 176mm.
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
gbj_tester
JesperXT
How low a Q factor do you need? And is this for something geared or single speed? If the latter, I'd go for Alfine, even though the Q factor is 176mm.