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@belugabob
I put 140mm on the rear of my (55.5cm) 4S disc, as that's what they recommend on the Kinesis website. The rs805 caliper is mounted directly, without any adaptor (but I did have fun working out that the length specified on the bolts referred to the thickness of the frame where the bolt passes through, and NOT the length of the bolt)
I weigh 90kg, and 160mm front & 140mm rear hasn't failed to stop me yet.