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@marxist_vulcan
Hi...Can some one help me?....Just bought on ebay a Dura-Ace rear mech...for £19...i asked the seller...7, 8 or 9 speed and his reply was 8 but could work on 9...fair enough...then i find when i get it is a a pre 1997...RD-7400...which according to Velobase is a 6 speed unit......So can i use it in either a 7 or 8 speed set up?....I have searched the net and cannot get a definitive answer...I have looked up Sheldon Brown too....If yes....what shifters will i need to get...will it have to be DA or can i use other Shimano shifters.......or has the seller misled me?...Should i just relist it on ebay......cheers....Leon