There are so many topeak racks I can't remember which one I ordered. I got Halfords to order it and fit it. As it happens I don't think it's one specially made for disk brakes but it still fits with good clearance. I wanted the one that took clip on ortleibs panniers and their own track mounted carrier bag. I also thought I would want the one with the spring loaded clip but in truth the slide in bag is so useful that I always go out with it on. The stays on mine are long enough but I don't know why Topeak want to make them in bright shiny silver when the rack is matt black. Mine are going to get painted with hammerite when I can be bothered.Tried alsorts. Took it back to shop. I have one coming into evans store later in week....and going to ask them to fit it. If i attached top arms first it was slanted and too close to seat for bag to sit comfortably
Mike