These are full ceramic! You can only use these on your road bike Want to run that oversized pulley look, but without rebuilding your derailleur? These pulleys fit on your stock cage. These Oversized Pulleys fit the latest generation of Shimano derailleurs: Dura-Ace R9100, Ultegra R8000/R8100 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 installing a longer chain.