Anybody else looking at these? Mine just landed. I'm waiting for a 19 inch rear wheel to arrive so I can mount the track and test it out. A hard rubber ring mounts on a 19 inch wheel and replaces the tire. It becomes the drive sprocket for the track which has a contact patch of about 5 inches wide and about 24 inches long. A special rim lock keeps it from slipping on the rim. 2 rollers in the back keep the track centered and in touch with the ground. It mounts to the bike with the stock rear axle and 2 swingarm brackets. The stock chain adjusters set the chain tension and another set of adjusters set belt tension. Total weight is about 20 pounds.