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The striking zig-zag rim base (called SPLINE ) attracts immediately the attention. It connects the spoke holes and stiffens the single-walled rim in addition.
Different to Enso, the desired stiffness is not sufficient and therefore the brains behind Enso KUROSHIRO are using a trick. Instead of stiffening the rim with more material, they fill a part of the groove with a light foam material. And some extra layer of carbon over it create a little cellular structure which increases massively the stiffness with only a few more grams. The extreme light foam (on the picture, the green material) is also used in the aircraft construction and wind turbine rotors« zurück zu Tunepedia