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Pretty sure 5500 and 6500 are both v1, unless they changed the design under the same model name?
They did, for 5500 at least. There are SM-BB5500s in both long and short spline versions, same part number. That's what I mean by Shimano keeping quiet about it. I think DuraAce Road and Ultegra had already gone to HT2 by then, and DA Track sticks with the short splines.
Pretty sure 5500 and 6500 are both v1, unless they changed the design under the same model name? Will have to double check, are they not cross compatible?