I've not checked the wear. It is bedding in nicely; teamed up w/ the front sturmey they are super controllable. Smooth linear braking, they both probably only have 100 mi and are still bedding in. I have them hooked to 1 lever. They don't grab like a cantilever or U brake does but they stop you fast. They are almost antilock; I've been riding in the snow the past couple days and haven't slid yet.