Are you ready to experience total drivetrain optimization? Kogel introduces Kolossos, the oversized and ceramic derailleur cage. Kolossos is designed to seamlessly fit and mount onto your current rear derailleur. Oversized derailleur pulleys are all the rage these days. Large derailleur pulleys cause less deformation in the chain and slower rotations in the bearings. Both lead to less friction and more efficient power transfer from legs to wheels. Kogel's goal was to build a cage so stiff it cages the chain, while providing all the benefits of oversized, low-drag pulleys. Kolossos is 3x stiffer than the main competitor and 2x stiffer compared to the stock cage on your derailleur.