So I picked up a 78 peugeot (A08 I think) that was rotting in a friends basement. I don't have tons of money to spend on it. So i used all the components already on the bike, minus new tubes and tires. The gearing that i was forced to go with by doing it this way is pretty high (52/16) I'm super out of shape and need to drop down I was thinking 42/16 or somewhere around there. I have looked for a new crankset but that seems to be hard due to the cranks being cottered.

Anyway I am trying to find a cheap fix. I am very new to all of this, and honestly all of the crazy prices for components is intimidating.

Thanks for the help in advance.