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As more bikes become disc brake only, wheel designers will be able to play with the rim shapes to make them more aero, this is where a load of benefits will come
My own experience: I was riding my TT bike in Ironman Zurich (appologies to all Triathlon haters). Climbing Heart Break hill, supporters shower the riders with cool water, however, immediately after HB Hill, there is a short technical descent, I hit my brakes at 35-40mph to go into the first corner, my brakes and wheels were wet, it was clear I wasn't going to make it, so I bailed and went straight on, crossing a small traffic island, and mounted the sidewalk, luckily there was a dropped curb on traffic island and sidewalk for pedestrians. My next TT bike will have discs.
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