Originally Posted by
FarHorizon
For speed, stability, and comfort, you just can't beat a trike!
Speed? Most adult trikes I've seen are the heavy singlespeed or three speed ones for the elderly and handicapped, or the industrials.
Like these.
Then there are the tricumbents like TerraTrike/WizWheels, which I am sure are quite fast but are probably rather difficult to get into and out of.