Ready to experience total drivetrain optimization? Introducing Kogel Kolossos, bringing low friction and precise shifting to GRX 12-speed gravel bikes with this oversized derailleur cage. This upgraded cage fits mechanical12-speed (RX820 series) drivetrains for Shimano GRX 1X rear derailleurs, featuring large pulleys (18-tooth narrow-wide bottom and 14-tooth top) and constructed with their strongest cage design yet.
Kolossos is the Greek word for a statue, much larger than the original subject. Seems fitting for an oversized derailleur cage. Besides being designed for World Tour victories, Kolossos gives you reduced friction, improved shifting accuracy, and better chain retention.
Please note: Installing an oversized derailleur cage typically requires replacing your chain to accommodate the larger pulleys. The overall length of the Kolossos is within a few mm of your stock cage, so ground clearance is not a concern. It is also equipped with road seals for optimal efficiency, but can easily be switched to cross seals for wet riding conditions.
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.
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.
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:
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
