Headtube length doesn't really tell you much due to the 410mm length fork.
However I can tell you a medium one would give you a stack of 57cm ( give or take).
I looking to get the exact measurements because I'm trying to have a Ti frame built to similar dimensions to a V2 long
also, saw a V3 large in the wild today, will take pics soon
Using what fork? Standard CX fork at 395mm, road are 375mm.
The frame builder may have to tweak the geometry significantly to be used with normal fork.
Email BMW as they have gotten quite good at replying emails.
V3 Large is out already?
@nohwol started
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Headtube length doesn't really tell you much due to the 410mm length fork.
However I can tell you a medium one would give you a stack of 57cm ( give or take).