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It's this one - http://velobase.com/ViewComponent.aspx?ID=6B1E605E-0922-474F-B4E6-68186A7EB15C&Enum=108&AbsPos=22 Which is 6 speed, but Velobase says it works with 7/8 as well.
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@GreatSince78
Hey Jon, is the Shimano 600 mech the 6400 7 speed of 6401 8 speed version, dibs if the latter please...