• No you cannot put flat mount calipers on a non-flatmount frame, no adapter exist. You could use post mount calipers but i’d avoid that

  • Why avoid using post mount? Post mount still work fine, sure you can get the calipers from a previous groupset

  • The new gen shimano stuff is optimised to use with the shifters; modulation is incredible; if you put old calipers on that, it negates the whole point of ‘upgrade’

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