Review on Stylrtop Aluminum Bearing Derailleur Pulleys by Antonio Baker

These roles seem to be universal. However, my Shimano r8000 Ultegra only accepts one tensioner. Why? Because these pulleys are too wide to secure the idler pulley with a shock bolt. The longer bar instead of the bottom pulley works great. These pulleys spin just as well as stock Shimano, maybe a little less. for running in a camp? Who knows. The placebo effect could work. You get what you pay for. The series roles are not much larger. Pay an extra $8 for stock if you don't want the colors I included in the setup photo on my Shimano Ultegra r8000. I have another photo of the tensioner and this is nearby. They're as thick as the idler pulley, so they only work at that point.