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Caliper basically mounts directly to the flat mount outwith any adaptors, to suit a 160mm rotor only.
They could have made it to suit 140mm but then you'd need adaptors for 160mm rotors - suppose they figured a seamless fit for 160mm was better than accommodating 140mm rotors.
Compare the Hope front caliper to Shimano (where I believe you reverse the adaptor to suit 140/160 rotors)
Why not? Deets? Ive only ever used 160 tbf, should stop spreading false info