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).
How does the stack height compare to other similar frames? Seems kind of high on the smaller ones I've seen
It is high, in fact my V2 Small have the same headtube length as my V3 medium (135mm).
BMW does nailed the geometry down enough to fit a wide range of people, as long the shorter one don't mind the excessive headtube length (for a BMW).
@Aches started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
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).