I am writing this update from inside a train, having left my bike in the bike-garage at the Central-station in Erfurt.
There have been some frightening clicking/cracking noises coming from the bike whenever I was pedalling with some force.
My suspicion that the root cause are broken ball-bearing in the Bottom-Bracket have been confirmed.
This means I will have to install a new one, and I hope the University Bike-Shop has some old spares that fit my frame.
If i cant find a BB that goes with my Crankset I can also install a new Crankset, It would certainly be an upgrade,
at least if I can find a sleek one.
I wrote a checklist of parts I want to overhaul or replace during lectures today and ordered it by priority levels.
I am going to just work down siad list, unless I find free parts for something further down already.
The end goal is having a fully working commuter that I can also take on longer weekend trips in the 60 to 120km range.