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Bigger Is Better
Oversized derailleur pulleys are all the rage nowadays. Big derailleur pulleys cause less deflection in the chain and slower rotations in the bearings.
Both lead to less friction and a more efficient power transfer between legs and wheels.

12/14T Oversized derailleur 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.

These oversized pulleys in Kogel blue fit the newest version of Dura-Ace R9200, Shimano's flagship 12-speed drivetrain.

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 other large pulley systems.