Stumpjumper FSR owners...

[Corvette]

I would need some info about the frame, preferably in XL size. How much can the seatpost be lowered without hitting the rear shock or linkage?

I made some brief calculations and got 7 inches (18 cm) for M size frame. Assuming that all models have the same swingarm and chainstay length and comparing the Stumpjumper geometry chart (http://www.specialized.com/bc/SBCGeometryPopup.jsp?spid=13871), where the seat tube is 3,5 inches longer (M vs. XL), the XL frame should have the clearance about 10,5 inches (27 cm). Correct me if I'm wrong.

[Spokompton]

I would need some info about the frame, preferably in XL size. How much can the seatpost be lowered without hitting the rear shock or linkage?

I made some brief calculations and got 7 inches (18 cm) for M size frame. Assuming that all models have the same swingarm and chainstay length and comparing the Stumpjumper geometry chart (http://www.specialized.com/bc/SBCGeometryPopup.jsp?spid=13871), where the seat tube is 3,5 inches longer (M vs. XL), the XL frame should have the clearance about 10,5 inches (27 cm). Correct me if I'm wrong.
One reason I've never fully liked those frames. Full seat tube is pretty mandatory for people wanting a wide range of seat heights.