The rear brake caliper mount post interferes with the torque arm (on Dengfu e55 frame). I had similar issue with Kindernay VII and I ground off some material from the torque arm to make it fits. But the interference with 3x3 torque arm is bigger and would require removing too much material from the torque arm and probably also from the shifter housing. So I removed some material from the rear brake caliper post with Dremel
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