Detailed Specifications
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Brand: Kogel Bearings
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Model: Kolossos Oversized Derailleur Cage w/ inner cage (OSPW)
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Pulley Sizes: 14T upper / 18T lower, ceramic bearing pulleys
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Compatibility: Shimano XTR M9100 and XT M8100 12-speed rear derailleurs
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Not Compatible With: Other Shimano groups or older 11-speed models
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Fits: XC, marathon, enduro, and trail setups
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Use: MTB, gravel, off-road endurance
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Color: Red
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Includes: Kolossos derailleur cage assembly with oversized pulleys and hardware
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Warranty: Kogel lifetime limited warranty
Additional Features
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Oversized ceramic pulleys dramatically reduce drivetrain friction for more efficiency
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Long-tooth narrow-wide lower pulley ensures superior chain retention in demanding terrain
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Lower pulley assembly integrates a chain catcher to help prevent jams
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Built with the stiffest Kogel cage to maintain precise shifting under heavy MTB loads
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Ground clearance remains virtually identical to stock cages (within 2mm)
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Ships with road seals for max efficiency, swappable to cross seals for muddy or wet conditions
Important Usage Notes
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Designed only for Shimano XTR and XT 12-speed derailleurs
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Installing this oversized derailleur cage typically requires a longer chain to fit larger pulleys
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Professional installation recommended for optimal performance
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Routine cleaning and lubrication of pulleys will extend life and efficiency
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Swap to cross seals if riding frequently in wet or muddy environments
Riding Impressions
Kogel’s Kolossos cage brings road-level drivetrain efficiency to mountain biking. By enlarging pulley size and reducing chain articulation, riders experience smoother pedaling, quieter operation, and less drag on long climbs and marathon courses. The added stiffness and narrow-wide tooth profile mean precise, reliable shifting across technical terrain, while chain security is maintained under hard enduro efforts.
Disclosure
Genuine Kogel Bearings product, retail packaged, with full manufacturer warranty. Includes Kolossos oversized derailleur cage assembly with 14T/18T ceramic pulleys in red finish. Compatible with Shimano XTR M9100 and XT M8100 12-speed derailleurs only. Chain, derailleur, and cassette not included. Covered under Kogel’s lifetime limited warranty (proof of purchase required).
