Originally Posted by
Jd512k
....Seat tube is 28.6mm, except at the weld/shell where it is slightly oval, which measures ~31.5. Assume per your info, the 111mm spindle will work?
Yes, according to the Campagnolo catalogs of the era, the 111mm BB will work with a triple, provided the the seat tube is 28.6mm (at the front derailleur mount).
Originally Posted by
Jd512k
Regarding the FD... the triple Campy is a 52/42/32 (20T differential as you stated), therefore I do need a dedicated triple FD, yes? How do I source/identify a triple FD? This Avanti FD has absolutely no part #’s or identifying marks other than the Campy logo, “Avanti” & “Made in Italy”. Additionally it is not a clamp on, it bolts to a tang welded to the drive side of the seat tube. Have yet to find one like it online.
Campagnolo triple front derailleurs of the period are identifiable by five characteristics, though not all are apparent unless viewed side by side with a double front derailleur:
1. The parallelogram linkage is longer, for the greater throw required with a triple crankset.
2. The nominal cage width is wider to accommodate the greater chain angles of a triple crankset.
3. The outer cage plate has an an indent along the lower edge to facilitate chain derailment due to the wider cage.
4. The inner cage plate extends lower than on a double to facilitate chain pick-up on the small chainring due to the greater differential in chainring size.
5. The cage curvature on the triple is slightly tighter, as it is typically used with a slightly smaller large chainring.
Most manufacturers tended to use clamp style mounts for triple front derailleurs, as they are sturdier. However, Campagnolo did make a braze-on version of their Avanti triple front derailleur. So, while they may be harder to find, they are out there... somewhere!
Originally Posted by
Jd512k
Studying the closeup pics I took of my son’s identical bianchi (only difference between his and the one I am rebuilding is his is an 8 spd triple and mine came as an 8sp double)... I see no difference in his RD and mine at all. I do see that his FD is indeed a different version though.
Forgive my ignorance... how is the RD affected by a double vs triple crank set?
Campagnolo derailleurs of this era, for a specific group, had the same large cog capacity whether they were for a double or triple chainring setup. Consequently, the bodies are identical. However, since the triple version has to wrap more chain due to the greater chainring differential, it should have a longer cage.
