encircle the world...
Cyr wheel is made from aluminium pipe.Diameter of pipe is 40mm, thicknes is 3mm with green pvc cover 5mm . Final diameter is 50mm . Wheel has a robust construction. Every wheel is made with proven techniques.The internal diameter be your height plus your fist, plus a couple of centimeters. But yeah different heights are good for different things, but that the height that's averagely good for stuff.