Instead of heavy & expensive cold forged yoke,SPF KBOX chain stay design makes the BB area
become much stiffer and substantial weight-saving.
Square SPF shaped top tube and down tube which make KM-500 have better lateral stiffness,
but it transitions to concave side-walls shape where meets the head tube.

All-new,redesigned SPF 3D-crest line rear triangle does not only supply the the riding stability for the frame,but also catch the gazes much more easily.
Thank to SPF technology that give such unique look to KM-500