I have a 1980s Peugeot Racer bike that has a broken right crank arm that snapped today (see attached photo(apologies it is upside down))
I am complete newbie with bikes. Do I need to replace just the crank arm or will the whole chainset and crank arm need to be replaced? I am looking for the cheapest possible way of doing this. Ideally I would be looking to buy a cheap 2nd hand replacement and let someone else fit this for me.
The crank arm is 21cm or 8 inches in length and reads 'Lasco f-12b'. Any help much appreciated.