Thanks Tonolinoa. I do wish On One would include more measrements in their frames details.
So I can compare with current frame, I would be grateful if you could measure two actual measurements on the frame.
The actual top tube, from mid point of seat tube where top tube intersects to the mid point of where the top tube intersects the head tube.
Same for the seat tube, centre of bottom bracket to mid point of top tube/ seat tube intersection.
Thinking that if I bought the frameset I can leave the fork steerer uncut until best position found.
Apologies to OP for thead drift, grateful for chance to ask owners about sizing.