The confusing part of this is that quercus is looking at a trike as an upgrade in the speed department. Normally 'trike' and 'speed' are mutually exclusive words, although in fairness maybe some trikes are faster than mountain bikes. I seem to remember that Wizwheels used to claim 3 mph speed improvement over a standard road bike, but I just don't see how. For speed, you should stick to 2-wheelers.