• I have some down tube shifters which are Campag Chorus and from looking on Velobase they were made as either 6,7 or 8 speed and were synchro or friction I think. They were on a bike with an 8 speed cassette and did not shift correctly all the time which led me to think that the shifters and cassette were not matched.
    My query is by looking at the shifters, how can you tell which speed they are?
    Thanks

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