Originally Posted by Philpug
Flex? The Look/Rossi have the shortest mounting distance and will let the ski flex more naturally, for your weight, it isn't a big concern though.
I believe there are two principal factors affecting ski flex, the main one for most skis is the length of the binding, but flex under the binding can also be significant. As you note, shorter mounting distance means less of the skis length is inhibited from freely flexing. The part under your boots is not of as much concern because the camber is being compressed into a basically flat shape designed to make the ski function.
I have been skiing (and loving) a pair of Watea 101s since the first year they came out. They are a soft no camber ski with a consistent tip to tail flex pattern, which means that if there is a flat spot under your boot during the turn they are not operating as designed. There are some rail flex type bindings that are designed to allow the ski to more freely flex under your boots and bindings during a turn, and I think that type of binding allows the Watea 101s to ski better.
Since I am a big guy, I feel my soft Watea 101s basically become a full rocker ski as soon as I stand on them in deep snow, and I have blown out of my bindings on more than one occasion hitting big compressions becasue the skis flexed too much under my flat mounted bindings. Regardless of a skiers size, the 101s are designed to be flex in a "big smile" pattern, and you don't want a crimp in the middle of your "smile."
I know the Marker binding "wide footprint" has been making a lot of press because of skis getting fatter, but I think as rocker skis proliferate we will see more rocker specific bindings with shorter footprints, and a mechanism allowing maximum flex under the boot. It does not make sense to get a full rocker ski and then put a binding on it that keeps if from functioning properly. The new skis are flexing differently, and I think bindings need to adapt. If it is not on the market already, I am sure we will see a rocker specific binding in the near future.