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Old 08-05-22, 11:04 PM
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70sSanO
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Bikes: 1986 Cannondale SR400 (Flat bar commuter), 1988 Cannondale Criterium XTR, 1992 Serotta T-Max, 1995 Trek 970

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I’ve always had the impression that cable pull and RD actuation movement, especially of older systems was not consistent from shift to shift/cog to cog.

As far as your older 90’s Campy setup, I thought the RD actuation ratio was 1.4:1.

I believe the new Shimano Tiagra, 105, GRX actuation ratio is 1.4:1.

It might be possible to run 9 speed Ergos to a Tiagra/GRX RD instead of a Campy RD.

John
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