Originally Posted by
wkatastrof
I have no front derailleur, but would like to add one.
Keep in mind your bike probably has a 1" diameter seat tube, and will require a front derailleur for that (now uncommon) size tube. Your best bet is likely the old parts bin at your LBS or bike co-op. Or you could use a shim:
https://www.universalcycles.com/shop...s.php?id=12155
Which bottom bracket spindle, 107mm or 110mm?
Chose your crank first, then use the spindle length that crank calls for.