This is general guideline for sizing ski bindings. Selecting a binding width is always based on how wide your skis are at the waist. You want to select a binding with a brake size equal to or greater than the waist width of your skis, but never smaller.

Ski Waist Width Recommended Binding Size Maximum Binding Size
65-75mm 75-80mm 90mm
75-80mm 80-85mm 90mm
81-90mm 85-90mm 100mm
91-100mm 100-110mm 115mm
101-110mm 110-115mm 120mm
111mm+ 115mm+ 130mm