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Why R1s/F1s...? Asking because I had a pair of TRP Hy/Rd brakes, which worked fine really but I couldn't see an advantage of the cable/hydro combination. They weren't quite as smooth as fully hydraulic, but weren't as simple/user-friendly as fully cabled. Admittedly I didn't attempt to bleed to calipers.
They were also very large and clunky units, which made mudguards etc. an interesting challenge. Of course this aspect might not apply to the Juin Techs, I've not seen a pair in real life.
I like the multi-project thread!
Nice one!