Btw, utfs didn't turn it up and Google makes it look unlikely - post mount calipers to iso mounts? If it can be done I'll wait for the tiagras and upgrade my existing bike. If not, new frame time I guess.
You could change the rear caliper to a post mount ala rs785 (or a mtb shimano one).
(I would be happy to take the spare flat mount caliper off your hands :))
@svenhöek started
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Btw, utfs didn't turn it up and Google makes it look unlikely - post mount calipers to iso mounts? If it can be done I'll wait for the tiagras and upgrade my existing bike. If not, new frame time I guess.