The rim of one of my bike could not be used anymore so instead of putting it into the bin I decided to put it on the wall in my bedroom. It has been there for almost a year now, and we can say that it runs well but in a different way not as it did on the road. :)
As a wheel hub, I used a cap of a jam, and the spokes come out of it. A piece of chain is used as the numbers, and the arrows are made of plastic which I cut out myself.