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low‑friction ceramic pulleys housed in sealed labyrinth bearings
Updated to a press fit bottom bracket system
whisper‑quiet operation and extends the life of your cassette and chainrings
Select road bearings for lowest friction
Aero Oversized Derailleur Cage - Shimano Dura Ace R9200 & Ultegra R8100 1st Gen low‑friction ceramic pulleys housed inBig pulley wheels were not the final step to free speed. Kolossos now comes in Aero, shielding your wheels and chain from the wind for those riders looking for maximum output. Aero Kolossos is built with Kogel ceramic bearings and road seals. Fully built in CNC machined aluminum with an internal spine for maximum stiffness, Aero Kolossos will help you cut through the wind as well as help you maintain shifting accuracy. When it comes to marginal gains,
