CeramicSpeed OSPW Pulley Wheel System for Shimano Dura-Ace 9250/Ultegra 8150 - Coated Races, 3D Printed Ti Pulley, Carbon Cage EA Cage Assembly

Features 13-tooth upper and 19-tooth lower, titanium pulley wheels with Grade 3 Silicon Nitride balls Titanium PVD coated pulley wheels are 3D-printed and hollow for additional weight savings and durability Robust cage crafted from polyamide and carbon fiber for durability and light weight Coated bearing races increase bearing service life by increasing hardness of race and reducing corrosion Compatible with Dura Ace 9200 and Ultegra 8100 series (Fits 11-30 and 11-34 Shimano 12spd Cassette options) Four spring tension settings allow customized setup based on ride conditions Integrated stop tower for simple installation and durability CeramicSpeed coated bearings include a lifetime warranty