A tough ball frame made of extra super duralumin, which is about half the weight of titanium and has titanium-class strength. The titanium bolt part is equipped with an air intake function by long hole processing, which is considered difficult, and realizes a comfortable start. All the parts are machine-cut and the parts are reviewed according to the size of the ball frame to establish the strength as a frame while maintaining the lightness.

■ Frame diameter: 50cm
■ Pipe diameter: 8mm (common to all
frame diameters) ■ Frame material: Duralumin
■ Screw material: Titanium (Screw size: JIS W1 / 2 ")