I have been trying to track this sound down for awhile, maybe you can help. The bike is an EVox 120 semi recumbent 21 speed. The bike makes a ticking sound when under moderate to load on any of the 4 highest gears, reguardless of which chain ring I am on. When I coast there is no sound. The clicking seems to be at the same speed that the wheel is spinning. The chain on this model is pretty long and loose. Any ideas would be greatly appreciated.