as a related question, have shimano changed the cable pull ratio for Ultegra 6800?
I can’t find a definitive answer to that question anywhere online, I’d be interested to know as Shimano 10 speed road mechs had the distinct advantage of being 9 and 8 speed compatible, meaning you could justify a lovely new rear mech and still operate it with your old but functional STi’s…
well I am successfully running a 10-speed 105 rear mech with 9-speed tiagra shifters and a 9-speed ultegra cassette and chain, if that helps? So I think the rear mechs just move by the amount they are pulled by the shifters.
However, I did hear that the pull ratios for the brakes changed at some point as the shifters and groupsets were upgraded (e.g. from 6600, to 6700 to 6800), but how true that is I am not sure.