KC uses the grubee frame with pedestal mount for both 2 and 4 stroke builds. IMO it's the best choice. It is a stronger frame than the KMB frame, it has tabs for a rear disc brake, the stays are wider giving more tire room. With the curved down tube it allows the engine to sit a little lower, and if going 4 stroke you could use the pedestal for a 3 point mount relieving some of the stress on the down tube if you wanted. I have had both frames and were I building another like them for myself I would spend the extra for the grubee frame every time.