Catrikes all come stock with a single idler, a chainkeeper, and chain tubes to cover the chain on its way past the right side of the frame tube. The stock Catrike idler mount is simple and bolts right into the frame, but doesn't float and relies on friction-inducing chaintubes that are mounted on with P-clips and sometimes rub against the frame tube. The good news is that, starting in 2012, higher-end Catrikes come with an Elite Power Side Idler or a Sport Power Side Idler, depending on the model year (older ones had the Elite idlers). Many times, however, one idler is not enough. That's why we offer an array of Catrike Idler Kits to help optimize your chainline.