BMC timemachine Mode D'emploi page 6

Positioning
- stack (SB) and reach (RB) of your bars (Figure 3a and b)
Figure 3a
Figure 3b
- seatback to the saddle tip, valid for all Arione and SLR saddles (SB)
- vertical seat height to the top of the saddle (VSH)
- BB height (BBH)
Figure 4