Kogel Bearings brought low friction and precise shifting to GRX 12-speed gravel bikes with this Kolossos oversized derailleur cage ($474.99). This upgraded cage fits mechanical 12-speed (RX820 series) drivetrains for Shimano GRX 1X rear derailleurs and is designed to enhance chain retention and reduce friction while shifting, even under load.
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.
See more at Kogel Bearings.
