So I've got this 1980s Schwinn World Sport converted to a fixed gear for fun, but since petrol prices have gone up quite a bit, I've decided that I wanted to commute with this bike. Now I could use my Cannondale but I don't think parking that on school campus is a logical choice. So, I've decided that I wanted to go for a 1x9 set-up on my beater.

Now, I'm not exactly 100% sure on what I would need to make this set-up work. As far as my knowledge goes, I would need:

- Rear Derailleur
- Shifter
- Cables
- Cassette

I know I'm missing things and I would gladly appreciate it if you guys could help me out on what I'm missing, small or big parts.

Thank you in advance!