I rode necessaryevil's new swing bike today. It was the most fun thing I ever rode. I figured I could build one for a lot less than the 500 bucks they go for on ebay. This is what i'm starting with, two 26" boys frames. I'm going to run a 26 inch wheel on the rear and a 20 inch on the front. Blue banana seat, sissy bar, and ape hangers.