The headset I used was the Chris King I2 44/56 ZS Tapered, not sure of the Cane Creek equivalent. I believe the only size rotor you can run on the rear is 160mm (it also says this on the Yeti specs). The caliper is directly mounted to the frame without room for additional hardware so can't see how to fit a smaller or larger rotor in that area. I run 160/180 but could probably get away with 160/160 on this bike. I have the Medium (29er), don't know if the S/XS frames are different.
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