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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?
yokes-
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.
gbj_tester
The difference between road and MTB is just axle length. The Sheldon Brown picture shows early & later Octalink, and applies to both road & MTB. The early version has short splines which proved too weak, so Shimano issued a second version with much longer splines and kept very quiet about the appalling balls up they had made of the first version.