What size cassette do you have and is the RD a short cage (ss) or long cage (gs) version ?
The B-screw may need to be reset if there was gap between the tabs when the RD was installed.
To reset it
Back the b-screw out all the way.
Loosen abit the RD bolt attached to the hanger
Push the b-screw tab up against the hanger tab and hold, and at the same time re-tighten the RD bolt.
Then re-adjust the b-screw for the 28t
Put the chain on the 11t cog while tightening the b-screw inwards (incrementally) then shift up to the biggest cog to check if it still rubs. You can spin the crank backwards and listen to how much noise the teeth are making. The keep doing the previous step,back and forth till the cog teeth/jockey wheel no longer make noise.
Last edited by trailflow1; 06-07-17 at 09:41 AM.