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.
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