The IDS-X Dropouts have a unique axle and dropout interface which locks the axle into place. This design eliminates the need for pinch bolts on the rear axle. We were tired of the rear ends of bikes coming loose after long days in the bike park so we set out to find a solution. After many one off prototypes we found this solution in the form of eccentric and conical shapes on the axle and dropouts. These shapes key into each other and lock the rear end down tight. In addition, the stiffer feeling rear end provides for better and more consistent cornering traction over traditional axle/dropout designs.