53cm C-T; seat-height, 71 (my pbh is 81). That IS a B67 saddle. Why ride anything else?
The crank is Shimano CX70, 36t single-ring. FW is White Industries 17t. Silver/Tektro brakes. The wheels are: Phil FW rear converted to single-gear 120mm; DT-Onyx front hub (not to be confused with the current Onyx hubs). Velocity Dyad rims, 700/36. Albatross bars. Tires, 42 (40 actual) Little Big Bens.
This is my 3rd attempt at a single-gear bike. I had 2 QBs (one converted to 650B, the other a used one bought from a friend). So far so good! I just love going out for an hour or two around San Francisco, finding less-hilly places to ride. On occasion I'll commute on this bike, if I want a little more of a "work-out" on the way to and from Rivendell.