Campy derailleur compatibility?

Doug Van Cleve said:

Howdy folks.

I just spent some time googling the archives and didn't find my answer,
so here goes. I know from experience (and based on Peter from Veccio's
recommendation) that there is no issue using a 10S rear derailleur with
'99 9S Ergopower as I am running that combo on a bike now. I just got
some 10S Centaur Ergopower and I am wondering if an 8 or 9S vintage
rear derailleur would be okay. Since the chain only touches the
pullies, I don't see where a fraction of a millimeter difference in
cage width could matter much so I'm thinking any 8/9/10S rear
derailleur should be fine. For the the front, since the cage is what
moves the chain, I am thinking I should stick with 10S. Correct or
doesn't matter?

Neither matters. If the RD is not worn out, any ERGO with ANY front or
rder....from Campagnolo, made since 1991, will work just fine...no
modifications in either direction needed...10s chain with 8s DERS or 8s
chain with 10s ders.

Quoted message said:

Thanks, Doug

Thanks Peter :^)

The chain does need to match the cassette though, right? It almost
sounds like you are saying any 8 through 10 speed chain is fine.

Doug

Doug Van Cleve said:

Thanks Peter :^)

The chain does need to match the cassette though, right? It almost
sounds like you are saying any 8 through 10 speed chain is fine.

Doug

Nope, match the casette to the chain..Sram PC-58 for 8s, Sram PC-950
for 9s, new narrow Campag Veloce for 10s....is my recs.

Thanks again Peter, that is what I will do :^)

Doug