I just installed new rotor, master cylinder, caliper/pads. I bleed the system using a phoenix bleeder. Checked to ensure tire is installed true and chain is aligned using a motion pro tool that attaches to the rear sprocket. Here is the concern. There is a very slight brake drag. So small that when you turn rear tire by hand it moves freely. You can only hear a slight metallic noise and you can see the virgin scratches on the rotor (see pic). I also checked that the rod that goes into the master cylinder and it is fully retracting. Is this normal or should I go back to the drawing board?
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