Originally Posted by
special_20
What I know:
- Circle B Bianchi logo seat cluster, fork crown, and lower headtube
- Brev Campagnolo rear dropouts
- Bianchi branded fluted seatpost (26.8mm OD)
- BB is not stamped or serialized. BB shell width is 26.8mm. I has a shimano cartridge bearing leading me to think standard (non-italian) threads)
- Seat and chain stays may be chromed. There are some paint chips. Paint doesn't appear to have adhered well. Underneath the metal is way shinier than bare chromoly steel.
Probably a higher end late 1970's model. Bianchi used the same frames with different model names depending on the components and market destinations.
There are a number of Bianchi experts in my area, in fact we have a CR Coppi memorial ride at the end of January every year.
It's their educated opinion that Bianchi frames from that era with Campagnolo dropouts (as opposed to other brands) plus seat stay tops, and fork crowns with the name, logo or letter "B" were built by the Reparto Corse shop in Italy.
How are you measuring the dimensions that you posted? The bottom bracket shell should be 70mm wide with 36mm Italian cups (both sides have right hand threads).
The Bianchi panto'd Campy seatpost is semi clearly stamped 27.2mm. That would usually indicate that at least the seat tube is Columbus SL tubing.
The paint appears to be powder coat??? Frequently frames that are fully painted but show traces of chrome plating underneath had rust damage to the chrome.
The components on the bike suggest that the PO didn't have any knowledge of the frames pedigree and just threw some mid range components on the bike.
verktyg
Chas.