The Radius Handlepost is forged from aluminum for strength and features patented Fusion™ technology for an incredibly stiff coupling with the frame and fork. The Radius Telescope handlepost is adjustable so no matter how tall or short you are, you'll get the riding position that is most comfortable. This Handlepost will only fit all Dahon Ahead systems on 20” wheel bikes, and 16" wheel Curve D3. Includes the 28.6mm diameter upper section, and everything apart from the top Q release. This is the modified type and as such represents an excellent replacement for both the Radius or Radius-V Handlepost.