I recently threw out my old 8 speed Campagnolo Athena group and replaced it
with 2006 10 speed Veloce. I've used a Mavic 10 speed chain. The chain
changes well and runs smoothly on all sprockets except the 13 of a 12-25
Veloce cassette. On the 13, it runs a little roughly. It took me a long time
to realise what the problem was, since the chain was correctly aligned.
Eventually I saw that the Mavic chain, which has almost straight edges on
the outer links, was resting on the spacer between the 13 and 14 sprockets
so that the teeth did not engage cleanly. The 12 is OK because the spacer
between the 12 and 13 is of smaller diameter than that between the 13 and
14. The 14 and 15 etc. are OK because, although the spacers between them are
of the same diameter as that between the 13 and 14, the sprockets are of
greater diameter and lift the chain clear of the spacer. The cassette is as
packed by Campagnolo, I have not changed sprockets or spacers.
A Campagnolo chain looks, on the Campagnolo website, to have much more
concave sides to the outer links, which would clear the spacer. A Shimano 10
speed chain, which I have on another bike, also has more concave sides.
Is this a problem that anyone else has encountered? The Mavic website says
that the chain is compatible with Campagnolo 10 speed but does not give an
email address for me to contact them. Or have Campagnolo put the wrong
diameter spacer in? The low point between the teeth of the 13 sprocket
barely clears the spacer between the 13 and 14 sprockets.