The Elektor Forum will close. See also this link. From Friday March 1st it is no longer possible to log in to the forum. However, the content of the forum will remain visible until the end of March. As of April 1st the forum will definitely go off the air.
As far as I know the ElektorWheelie is specified for people with ≤ 90 kg or about 200 pounds - my weight is 85 kg I think it is stable enoug when I had the chance to drive the prototype for some minutes. Every wheel can stand 90 kg alone at least.