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The proper adapter is already in place. I also just got a reply from Genesis that 160 is officially approved by them.
Now one more question - is there any noticeable difference between RT64 and RT70 IceTech rotors?
I have spare RT64s from previous bike, here I have one RT70, I could get the second one too, if there is any significant improvement. On the other hand, I heard a lot about IceTech rotors being more susceptible to warping, what is your experience?
160 can be used fine, you'll just need an adaptor to step up the caliper so it can take the 160mm rotor.