16-01-20, 10:30 PM
You could try putting it on the center stand and then apply the rear brake with your foot and with the brake applied rotate the wheel back and forward and check if anything is moving or making noise with the brake applied. Could be the pads moving in the caliper or loose caliper/tie bar as gerkin said. If it's not the coming from the rear brake it could be the wheel bearings, the swing arm bearing or suspension bearings. Think that's about all it could be if it's coming from the rear