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@marxist_vulcan
Thanks for the advice...but...and i have checked with dura-ace.com...7400 group went a few changes....my RD is the first generation...ie 6 speed...RD-7401 was 7 speed and RD-7402 was labelled 8 speed...9 speed did not arrive until 1997.....I know the RD is 'dumb'.....what is important is the shifter-cassette combo.....7-7 or 8-8 0r 9-9......but both Sheldon and Velobase argue that i would need a Dura-Ace 6 speed shifter...unless i use a special routing into the RD.....Which seems a big fuss and perhaps i should stick with my 105 6/7 speed RD.....or can i mate the RD-7400 with any Shimano shifter to give smooth indexed gear changes?