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Easy to install onto Shimano R9100 or R8000 series di2 or mechanical rear derailleurs, this Kogel Kolossos Road Seal oversized cage and pulley wheel combination is a watt saving upgrade for any high-end road bike. The 12-tooth upper and 19-tooth lower pulley wheels reduce chain articulation and have minimally sealed but durable ceramic bearings to significantly improve drivetrain efficiency.
The pulley wheels are housed within a tremendously stiff cage that cancels the vague gear shifting often associated with oversized setups. The cage integrates a chain catcher, and this combines with the extended tooth profile of the lower pulley wheel to maximise chain retention and minimise jamming over rougher surfaces.
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