Kogel Kolossos OSPW 12/19T for Shimano R9100/R8000, SS/GS, Ceramic, Black

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

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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

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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

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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.

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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).