In response to Jaz's PM, it's 54cm along the tube tube, from where it hits the seat tube to where it hits the head tube (i.e. not estimation of mid-points as is sometimes done).
@YannickVert started
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In response to Jaz's PM, it's 54cm along the tube tube, from where it hits the seat tube to where it hits the head tube (i.e. not estimation of mid-points as is sometimes done).