flat mount calipers are not made to work on post mount frames. There are a couple of special adapters such as these but $$$. you might be better off purchasing a pair of post mount calipers though.
Much appreciated! I knew a company somewhere would do them. The price isn’t great but at least I have the option 👍
no worries. though at 40$ each, plus shipping, plus the extra bolts... a pair of ultegra calipers is 100£...
I’ve got a set a Shimano post mount callipers for not much money. Pm me if interested.
@John-The.Raven started
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flat mount calipers are not made to work on post mount frames. There are a couple of special adapters such as these but $$$. you might be better off purchasing a pair of post mount calipers though.