co-zeta reverse engineers compression numbers based on spring rate   [see zeta_backwards_shc.xlsx] Each zeta curve is for a specific bike and lev ratio, as well as internal shock components that can influence the damping curve.  2018 WP shock components in order of importance. flsprs and spring, mv piston, cadj piston As time progresses the older versions become obsolete and are removed.  e.g.  We are currently at v5. The "sh target curve" description is based on c-zeta numbers at 1ips, 5ips, 50ips and are appended with _a, _b, _c, etc.   For example: 145_80_37_f The appended letters represent which psh and flsprs is used in the press test. v5:    _a = 12sxf450-psh, 15 flsprs and spr v6:    _b = 16sxf250-psh, 15 flsprs and spr v7:    _c = 12sxf450-psh, 16 flsprs and spr v8:    _d = 16sxf250-psh, 16 flsprs and spr  (NULL haven't created a curve with this flsprs combination) v9:    _e = 12sxf450-psh, 16sxf250-psh, 15 flsprs and spr v10:  _f  =  mx18-psh, 15 flsprs and spr v11:  _g  =  mx18-psh, 16 flsprs and spr  (NULL haven't created a curve with this flsprs combination) Pressure differences The 2012 and 2016 psh have different dyno gas force   2012 = 73c,  77 dynamic   2016 = 69c,  73 dynamic The 2015 and 2016 flsprs produce different ca force curve and therefore different ca% targets.