Originally Posted by
Kapusta
2- check the hangar alignment. Preferably with a tool. If you don’t have one, consider buying one. It will do a lot more good than whatever money gets wasted on trying to upgrade this bike.
Best advice for any shifting issue. Get a $50 tool off amazon and you will be impressed by how much hangers are out of alignment, even new ones. there actually should be sticky or forum rule to not even post a shifting question before hanger is verified.
There is no eyeballing to verify. trust me, i tried and ended up buying the tool just to see my hanger was quite out and straightening resolved all my issues and made adjustment a breeze. That and check cables. BSO use horrible cables and housing and after some use they suck even more.