Cross post from my CP thread, in case anyone wants to mount a juin tech R1 front brake on IS mount forks and use it with a 160mm rotor (A kona p2 fork in my case). I tried with various adapters and couldn't get it to work, either the caliper interfered with the IS tab or the caliper sat too far out on the rotor, only about half the pad would engage. Finally I gave up and went with a 180mm rotor instead. There are others who have failed and also arrived at the 180 mm rotor solution:
Cross post from my CP thread, in case anyone wants to mount a juin tech R1 front brake on IS mount forks and use it with a 160mm rotor (A kona p2 fork in my case). I tried with various adapters and couldn't get it to work, either the caliper interfered with the IS tab or the caliper sat too far out on the rotor, only about half the pad would engage. Finally I gave up and went with a 180mm rotor instead. There are others who have failed and also arrived at the 180 mm rotor solution:
https://groups.google.com/forum/?_escaped_fragment_=msg/650b/QhZA3dHfDYA/1ZMKaMU5AQAJ
https://forums.mtbr.com/brake-time/mounting-juin-tech-r1-51-fork-997535.html