Here is my 650b in the fixture. This was a project I started out with in may last year, but due to a number of things it was put on hold until now. It’s designed around a 130mm White Brothers fork and the frame is a mix of Columbus Life and True Temper OX2 tubing. The seat tube is a 35mm Life top tube with one butted end removed and sleeved to take a 31.6mm seatpost (to be able to run a Crank Brothers Joplin quick adjustable seatpost for long descents in the Alps or the Sierra Nevada). Geometry is a 69 degree head angle matched with a 73 degree seat angle. This is a degree steeper than I usually like to build my frames, but due to the 20mm set-back of the Joplin post I end up sitting in almost the same sport. That means that I need to dig up a rigid post with 20mm set-back as well.