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Built with high-quality stainless steel bearings
Bolt-on speed—so fast it's almost cheating
The threads on all modern Shimano HollowTech II preload bolts are the same
the Kolossos ST delivers crisp
smooth performance
Oversized Derailleur Pulleys for Shimano Dura Ace R9100 - Hybrid Ceramic - 12/14T Color:Blue Built with high-quality stainless steelOversized 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 to install a longer chain. Here is a video explaining how to
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