Oversized Derailleur Cages Ready to experience total drivetrain optimization? Introducing Kolossos, Kogel Bearing's ceramic oversized derailleur cage. Kolossos was designed to seamlessly fit and install on your Shimano road rear derailleurs. There are many ways to describe Kolossos. Our favorite is "Mind Blown"! Bigger IS Better Oversized derailleur pulleys are all the rage nowadays. Big derailleur pulleys cause less deflection in the chain and slower rotations in the bearings. Both lead to less friction and a more efficient power transfer between legs and wheels. Kolossal Performance Kogel’s goal was to build a cage so stiff that it holds the chain like a stock cage, while offering all the benefits of low drag oversized pulleys. Kolossos is 3x stiffer than the main competitor product and 2x stiffer compared to the original pulley cage on your derailleur WHY Upgrade/Replace Your Derailleur Cage Many oversized pulley systems are plagued with vague shifting due to the lack of stiffness of the components. Plus, your stock derailleur's efficiency is limited by the size of the factory derailleur pulleys. Kogel Oversized Derailleur Cages are: Built to offer low friction while maintaining shifting accuracy. Built for road as well as off-road use, we are not here to restrict your adventures Engineered with a long-tooth profile on lower pulley for better chain retention.