Aluminum sensor guard for Shimano ebike wheel sensor. The chain stay mounted sensor is the Achilles heel of the Shimano ebike platform. All it takes is a stick in the wheel and you are stuck pedaling that 50+ lb ebike home with no power. So far so good for testing. I utilized the stock chain stay bolt and disc brake zip-tie anchors, for a solid mount that does not even touch the frame. The ‘window’ allows for sensing the spoke-mounted magnet, while the open-back design allows debris to fall away. I imagine this will be unnecessary in coming years as manufacturers realize how vulnerable this crucial component is, and find ways to integrate the sensor into the chain stay. Mounted on 2020 Norco eRange, best bike I’ve ever ridden.