BRAKE MOUNT ASSEMBLY
IS mount (international standard).
I have tested it with magura, shimano, gatorbrakes...
Attach mounting bracket to rear axle. Use only 203mm rotors.
Install connecting rod between mont bracket and swingarm. Leave screws loose.
Adjust chain tension and thighten the rear axle nuts
Instal rear caliper and tighten the connecting rod screws.
The caliper bracket and dropouts are designet for some 20mm of horizontal wheel movement.