I know that the advantages/disadvantages of the Look/FKS Pivot-type turntable heel bindings have been covered in this and other forums ad nauseum. Yes, they are lower, have less delta, lighter, simpler (maybe not), solid. They also have less adjustability, a bit finicky to put on in deep snow, etc.
The one aspect that is repeatedly mentioned is that it is easier on the knees because of the rotational freedom of the turntable heels. But, in reality, all of that has been based on subjective evidence, etc. Has anyone ever seen actual measurements that have shown explicitly that the turntable heel is so much safer? (I know that is not an easy thing to prove).
I have been thinking about this for a bit since I am trying to decide on either the Look/FKS Pivot 14 versus the standard PX-12/Axial 2 type of bindings for my next pair of ~105 mm skis. Looking at the Pivot type of binding, it seems obvious that a turntable heel allows the foot to pivot if disengaged from the toe binding and still attached at the heel. But, thinking about this carefully, I am starting to doubt my own observations.
For a non-pivot type of binding, If during a fall your ski twists sideways, I would expect, if all settings are appropriate, that the toe and heel would release virtually at the same time since the wings on the toe would move sideways and the heel no longer being pressured from the toe binding would also release.
OTOH, on the pivot type of binding, if the same thing happened, somehow the conventional wisdom believes that the ease of release would be more "instantaneous" or less stressful, since the turntable allows the heel to rotate. BUT, once the toe begins to release, I find it hard to believe that the heel, without that consistent fore-aft pressure would still somehow be attached to the turntable, rotate, and then release more safely. Is it even possible to remain locked in the heel without the toe being engaged - seems unlikely to me - maybe someone has evidence of that? So, if the functionality of the heel as being more free to rotate is its great selling point, not sure if it is truly an advantage.
All of the above assumes that the binding settings are all appropriately set for the skier's weight and ability.
By the way, I love the elasticity of the Look/Rossi bindings and don't think I would ever go with anything else. I am just trying to get a better handle on the advantage of the Pivot-type of heel relative to the standard binding. Is it truly worth it for us mere mortals that don't need a 14 DIN binding to go with the Pivot 14 versus a regular PX12. I normally ski at DIN 8-9 on the PX12 and never experience any pre-releases; the built-in elasticity is amazing!!
Has anyone seen any objective comparisons between the two types of bindings that truly address my question? I am planning on buying some new bindings this weekend, so input would be greatly appreciated.