●【Presenting the Best】TRiPEAK ceramic bearing offers distinguished smoothness to your paddling. Being 58% lighter and 120% harder, the pulley grants creamy chain rotation with notably less friction and noiseless. ●【Oversized Pulley】12&14-Tooth oversized design with wide and narrow tooth shapes. Offering precision in chain engagement, ultra smooth performance and significantly reduced friction. ●【Derailleur Compatibility】Fits SHIMANO Road Ultegra 8000/Dura Ace 9100/105 R7000 11 speed series, with the least drag ever. ●【Longer and Further】Featuring extended durability and 2x longer-than-average lifespan, TRiPEAK pulleys with ceramic bearings are designed to maintain consistent performance. ●【Minimum Friction, Maximum Power Transfer】Provides low friction, enabling stable chain retention, crisp shifting with the least drag. Unparalleled smoothness is guaranteed.