Chuck wrote:
> based on Campagnolo's catalogs the Cambio Corsa was always a four
> speed derailleur (the later Paris-Roubaix was either a four or a five
> speed derailleur depending on the spoke disc used).
That is not quite right. The oldest Campagnolo drawings that I have seen of the Cambio Corsa all had either 2 cog or 3 cog freewheels. It likely wasn't until the second decade of life of the gear that most bikes using it were fitted out with 4 blocks. The dropouts are however not long enough to safely handle most five blocks. I have been told that this is why the Paris-Roubaix dropouts had 2 added teeth.
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Steven Maasland
Moorestown, NJ