Kogel 12/14T Oversized Pulleys for Shimano Dura Ace R9100, Ultegra R8000 and 105 R7000: Oversized pulleys fit the latest generation of Shimano derailleurs: Dura Ace R9100, Ultegra R8000 and 105 R7000.
By using the standard cage on your Shimano derailleur, you will feel the benefits of reduced articulation in the chain, while retaining accurate shifting. Something that has been a negative side effect of many large pulley systems.
Switching to an oversized set might require to install a longer chain.
