In reply to ams558:
AT Boot Comparative Flex
The list has been (un-scientifically) compiled by:
a) Posters' input comparing their stiffest AT/Freeride boots' flex (Endorphins, Tornado, Aero Freeride) against their alpine boot. A single alpine boot brand's flex range (in this case, Salomon) makes for better comparability in contrast to mixing flex ranges from Lange, Tecnica or Nordica.
b) Once the stiffest AT/Freeride boots flex ratings have been established, the ratings of the softer AT boots were established down the flex range fine-tuning up or down according to, again, posters' input.
Alpine boots used for comparison
140 - Lange 140 RS
100 - Salomon X-Wave 9
95 - Salomon Gun
90 - Salomon X-Wave
THE LIST (stiffest ---> softest) as of March 10, 2013
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130 - Dynafit Vulcan, Tecnica Cochise Pro 130
120 - Scarpa Mobe, Tecnica Cochise Pro 120
100 - Scarpa Maestrale RS, Dynafit Mercury, Tecnica Cochise Light 120, Black Diamond Factor, Dynafit Titan, Titan UL, Scarpa Hurricane
95 - Scarpa Typhoon/Skookum (stiff tongue), Garmont Endorphin, Garmont Axon
90 - Dynafit TLT5 Performance, Dynafit One PX, Black Diamond Quadrant, Garmont Radium, Dynafit ZZeus, Dynafit Aero Freeride (4-buckle)
85 - Scarpa Maestrale, Scarpa Tornado/Pro (black tongue), Dynafit TLT5 Mountain, Scarpa Spirit 4 (black stiffer tongue), Garmont Adrenaline, Dynafit Zzero ("Green Machine") CF 4-buckle, Black Diamond Method, Salomon Ellipse e2
80 - Scarpa Denali XT/TT, Scarpa Spirit 4 (green softer tongue), Lowa Struktura Rodeo/Pro, Dynafit Zzero PX 4-buckle
75 - Scarpa Rush, Scarpa Spirit 3, Garmont Megaride/G-Ride, Lowa Struktura Evo, Dynafit Aero Speed (3-buckle), Dynafit Zzero CF 3-buckle
70 - Scarpa Matrix, , Old Scarpa Denali (4-buckle red shell), Dynafit TLT 700
60 - Scarpa Laser, Garmont Dynamite, Dynafit TLT 500 (2-buckle + strap), Scarpa F3
50 - Scarpa F1, Garmont Megalite, Dynafit TLT 4 Evo (3-buckle), Dynafit TLT 4 Lite (2-buckle + strap), Dynafit Zzero 2C
40 - Scarpa F1 Race (2-buckle, no strap), Dynafit TLT Race Pro (1-buckle + strap)