Detailed Specifications Brand: Kogel Bearings Model: Kolossos Oversized Derailleur Cage (OSPW) Pulley Sizes: 12T upper / 19T lower, with precision ceramic bearings Compatibility (Derailleurs): Shimano GRX RX800/RX810 and Ultegra RX800 series (mechanical & Di2), designed for 2x road and gravel drivetrains Drivetrain Speeds: 11-speed and 12-speed 2x GRX drivetrains Not For: GRX 1x setups — use the dedicated GRX 12-speed 1x Kolossos model instead Intended Use: Gravel / Cyclocross / Endurance Road / All-Road Materials / Build: Oversized aluminum cage with ceramic bearing pulleys and reinforced inner cage for stiffness Color Options: Black, Red, or Gold Includes: Outer and inner cage assembly, 12T upper pulley, 19T lower pulley, mounting hardware Warranty: Kogel Lifetime Limited Warranty Additional Features Reduced Friction: Oversized ceramic pulley system significantly decreases drivetrain drag, ideal for clutch-style derailleurs used in gravel and cyclocross. 2x-Specific Design: Optimized for Shimano GRX 2x drivetrains for smooth front shifting and consistent chain tension across chainrings. Enhanced Chain Retention: Long-tooth 19T lower pulley improves stability and prevents dropped chains on rough terrain. Chain Catcher Integration: Built-in chain catcher minimizes risk of jams and chain derailments. Gravel-Proof Construction: Engineered with stiffness and precision to handle off-road conditions without sacrificing shifting accuracy. Performance Efficiency: Delivers “free watts” by reducing drivetrain losses, translating into smoother pedaling and faster speeds over long rides. Important Usage Notes Compatible with Shimano GRX RX800/RX810 and Ultegra RX800 series derailleurs in 2x configurations (11- or 12-speed). Not compatible with GRX 1x setups — use the Kogel GRX 1x Kolossos instead. Installing this OSPW system usually requires a longer chain for correct wrap on 2x drivetrains. Adjust B-tension and confirm chain length for optimal performance and shifting precision. Maintain regular chain cleaning and lubrication for best efficiency and bearing longevity. Riding Impressions The Kogel Kolossos RX800 2x system transforms drivetrain performance with its oversized 12/19T pulley configuration. The ceramic bearings reduce friction for noticeably smoother pedaling, while the stiff cage ensures crisp shifting even in harsh off-road conditions. Whether climbing gravel roads or racing endurance events, riders benefit from quieter operation, better efficiency, and improved chain control — all with signature Kogel durability. Disclosure This listing includes the Kolossos oversized derailleur cage assembly with 12T/19T ceramic pulleys and mounting hardware.Derailleur, chain, and cassette not included.Genuine Kogel Bearings product, retail packaged with lifetime limited warranty (proof of purchase required).
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