In this article I will share my experience with RISK Button Washer for Shimano Ultegra R8170 and Dura Ace R9270 Di2 Shift Levers that I use on my Canyon Ultimate CF SLX 8.0 Di2. It is an enhancement for the shifters so it gives you better and easier control of the buttons under the hood of your levers (that you can use to switch screens on your Garmin Edge 840).
