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Thread Starter 
I have a question regarding the flex index of my Tecnica Rival X9 boots. Specifically, does anyone know what the flex index is when the red or yellow inserts are placed in the cuff? The red inserts give a moderate stiffness increase, and the yellow inserts give even greater stiffness. (Not sure how they achieve this -- looking at how they are fitted, it's not immediately apparent to me how they work -- but the difference is noticeable).

Also, the manual states that the cuff can be locked with the addition of a second bolt in the pivot adjustment, to achieve the maximum stiffness -- what is the flex index when this bolt is added?

According to Tecnica, the rated flex index is 70, and I assume this refers to the boot without inserts or cuff lock bolt this correct?

Many thanks,