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Its ceramic bearings provide superior performance and enhanced durability
Choose road bearings for road bikes
Stock pulleys come with cross seals only
This bearing set is ready to plug a Sram GXP crank in a Trek BB90 road frame
Aero Oversized Derailleur Cage - Shimano Dura Ace R9100 & Ultegra R8000 CERAMIC OVERSIZED DERAILLEUR PULLEYS Its ceramic bearings provide superiorBig 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,
