HELP! I'm running out of ideas

340duster340 said

those are the HD late model 11.75" "cop" rotors.

doubt the bearings are the issue.

Click to expand...

They don't have to be 11 3/4 inch rotors to have the reinforcing ribs in them.
Many standard size 10.8 rotors have them.
Very common, nothing special to them at all.