In fact, this bicycle doesn't use any metal parts at all -- the solid tires are made of reconstituted rubber and a car timing belt is used instead of a chain.
For example, NanoSonic in Blacksburg, Virginia, has created metallic rubber, which flexes and stretches like rubber but conducts electricity like a solid metal.
The hybrid design which Mr Jubb has come up with uses a solid fuel called hydroxyl-terminated polybutadiene, a form of synthetic rubber used to make things like aircraft tyres.
