Originally Posted by
dsbrantjr
Yes, that could be helpful if the braze-on FD mount is too high for a small crank.
If the braze-on mount isn't too high, I recommend using the Shimano FD-CX70 cyclocross front derailleur. It's designed for smaller rings, like 50t or 46t.
I recently put a triple (90s Deore M550 48/38/28) on a steel race frame (90s Giordana), and the braze-on tab was just fine for a new Claris FD-2403 to shift those smaller rings. The frame is a stage racer, designed for 52/39. But I'm building it for a friend for his first RAGBRAI, so the triple will be way better for him on the hills.
Just saying that the braze-on FD tab may reach a crankset with smaller rings just fine. Or it may not. Best of luck!