Breaking power is unusable in descents, at least with the provided pads, even in dry conditions. Do not buy. Consider these carbon wheels only with rim brakes. Also rear hub came mounted but with looseness in the order of mm. Otherwise, in terms of speed they are very satisfying, very fast, a huge difference comparing with my previous stock aluminium box profile wheels. They are also very light and stiff, so I use them for climbing with no problems in my Trek Emonda.