Originally Posted by
T-Mar
The 111mm bottom bracket was intended for double crankset and also triple crancksets when used with frames having a 28.6mm seat tube. There was a 115.5mm bottom bracket intended for triple cranksets when used with frame having a 32mm or 35mm seat tube.
Avanti had a dedicated triple front derailleur. The double version had a claimed capacity of only 15T and most Campagnolo triple cranksets of the era had a 20T differential .
Thank you, T-Mar!
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?
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.
Thanks so much for the help! Really appreciate it.
Fair warning.. the crank set conversion is just the beginning 😁. Have questions regarding headset, quill stem, OA bath, hubs... cassette... but those will have to wait lol.