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I was worried, a lot, while building the bike, even more when the Kinesis 4S Disc frameset that was announced to be 160 compatible at the rear... came out to be a lie / design fail... But even with mech calipers its ok, haven't crashed yet :D. I use TRP normal discs, but got a 140 + 160mm rotors with dissipation for free and tried them with nice results http://www.reverse-components.com/en/products/discrotor-aircon-%C3%B8140mm
thanks for that. interesting. unsure what to do. don't fancy buying loads of different discs, as they don't hold much value second hand. i would like to blame the gappyness of the rotors for the slightly underwhelming stopping power