The Optima Baron Power Idler Kit replaces the stock idler under the seat with a high quality, quiet, stiff, durable T-Cycle Power Idler. The Clamp-On Idler Mount and Chain Keeper allows the idler and chain keeper to float as you ride, shift and bump. This kit also comes with the hardware to control the return chain in a simple and effective manner. For riders who like to run with their return chain in the dropped position this is a great way to keep it fast and efficient!