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What did you do about mounting the flat mount brakes onto the post mount frame?
Took a bit of searching for this!
https://www.assolutions.ca/shop/adapters/flat-mount-adapter-for-is-frame/
And it took some careful filing down to get the pads perfectly centered as it allows not adjustment. I also widened one of the bolt holes for a bit of wiggle. And it means you have to run a 180mm rotor on the front, which is no bad thing in any case.
What did you do about mounting the flat mount brakes onto the post mount frame?