For Optima, the "focus is on the rider, the bike, and the purpose, and not on the trends of the year." TerraCycle couldn't agree more. That's why we make Optima Idler Kits that make the bike better and the rider's job easier and more enjoyable. You'll notice an extra kick when you upgrade from the force-robbing stock idler to a TerraCycle power idler. Get the power and the return idler to make your ride as smooth and quiet as possible for years on end.