In comfort bicycles from Alter Cycles used a frame with swap different down tubes. It’s actually more curved, flexible bow-like … thing, that’s available in three levels of stiffness and the stiffness of the ride can be altered to suit the rider. Mark Groendal, an inventor of the Reflex, essentially redesigned the classic diamond frame that was designed over a hundred years ago. By modifying the front triangle into “the modified triangle” that flexes changes everything about the ride and…