Pure convenience. Fold your trike, put it in the back seat of the car, or the trunk. Then you can head out through the metropolis straight to the trail head or the meet up point. The folded trike in inches is 38″ x 38″ x 34.5″. Rear racks do not come with the trike. They are available for the Trike-F but it won’t fold with the rack attached.