Rock solid chain control means crisper shifts while Ceramitech bearings channel all your hard work to the ground.
Each cog set features DELRIN® 510GR construction, a fiber reinforced polymer specially suited to high strength situations where resistance to deflection is paramount, such as every time you shift. The Ceramitech bearings are in-molded for absolute security and durability as well as ease of maintenance.
These pulleys are compatible with:
R8000-series Ultegra (mechanical and Di2)
R9000-series Dura Ace (mechanical and Di2)
R9100-series Dura Ace (mechanical and Di2)
R9200-series Dura Ace (mechanical and Di2)