FINNEY1973":1t27mk8q said:Velobase confuses me when it comes to 1990 - 1994ish 8 speed mechs - ties in with the Index technology but it describes them as friction derailleurs? Surely if they are part of the 'group' then the Record & Chorus mechs must be index?
Technically it's the shifters/ergos that are indexed not the mechs. While Shimano designed their whole groups to work with indexing, Campagnolo tried to make everything back compatible and it didn't really work.