Thanks Ian, fit was on a Fizik Mistica.
BRP (Biomechanical Reference Point) is the point that identifies the anatomical center of the saddle (mid-line reference).
Image here of the measurements and diagram if that helps > https://ibb.co/8cLrfPj
BRP (Biomechanical Reference Point) is the point that identifies the anatomical center of the saddle (mid-line reference).
Image here of the measurements and diagram if that helps > https://ibb.co/8cLrfPj