Detailed Specifications Brand: Kogel Bearings Model: Kolossos Oversized Derailleur Cage w/ inner cage (OSPW) Pulley Sizes: 12T upper / 19T lower, with ceramic bearings Compatibility (derailleurs): Shimano Dura-Ace R9100/R9150 and Ultegra R8000/R8050, mechanical & Di2; fits SS (short) and GS (mid) cage right out of the box Speeds: Designed for 11-speed R9100/R8000 series road groups Use: Road, crit, tri/TT; suitable for on-road and off-road use Materials / Build: Oversized cage with ceramic pulley bearings, road seal configuration for low drag Color: Black Includes: Outer + inner cage assembly, 12T upper pulley, 19T lower pulley, hardware Warranty: Kogel lifetime limited warranty Additional Features Extremely low friction plus high cage stiffness for precise, loss-free shifting Long-tooth 19T lower pulley improves chain retention, especially over rough terrain Built-in chain catcher on the lower pulley helps prevent chain jams Ships compatible with both SS and GS derailleurs—no extra parts needed Ceramic bearings and road seals balance speed with durability for racing and training Important Usage Notes Shimano-only fit for the R9100/R8000 family (11-speed). Not compatible with R9200/R8100 or SRAM/Campagnolo derailleurs Installation should follow Kogel’s torque and alignment instructions for best performance and bearing life Check chain length and B-tension after installation; oversized pulleys typically require adjustment Use with a clean, well-lubricated chain to maximize efficiency and bearing longevity Riding Impressions Switching to 12/19T ceramic pulleys reduces drivetrain friction and delivers smoother, quieter shifts—especially under load. The stiff cage combined with the long-tooth lower pulley keeps the chain stable in sprints, sharp corners, and over rough road sections. Riders report a “free-speed” effect, with more confidence in shifting precision during hard efforts. Disclosure Genuine Kogel product, retail packaged, sourced through authorized distribution. Includes Kolossos inner and outer cage assembly with 12T/19T ceramic pulleys for Shimano R9100/R8000 series. Derailleur, chain, cassette, and tools are not included. Covered under Kogel’s lifetime limited warranty (proof of purchase required).
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