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.
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