Evel Knievel's XR750, note the scaffold tube foot-rest.
On the other end of the scales, Jacapo Monti's new line in carbonfibre sprockets. The current prototype only lasts for 3 hours but a new diamond toothed version should last 5.
And 6' 3" aboard Alberto Narduzzi's flat tracker; just to show that even though there is big air above the engine ie. it's a little high for a race bike, it doesn't look daft (apart from the fact that I'm sitting on it). BP