JRT = J Rad Tribute. Developed as a simple bicycle to take you to the village pub with a degree of style & panache. The original J rad was designed by Paul Jaray & in production from 1921 to 1923. Our technical interest in bicycles is to explore alternative drive systems. Our JRT is equipped with the novel 'Ebneter hub'. The platform is used to explore all unusual drive systems (string drive, belt drive, etc.).