Partner's burner bike has some really worn chainrings which are causing a lot of chain slipping esp. when pedalling hard/uphill. Thought about replacing just the chainrings but having had a look online I feel totally bamboozled by the number of options (e.g. number of ways I could fuck it up) there are for front/middle/inner, BCD, number of teeth, number of bolts etc etc. Also they seem to be way more expensive than I was expecting?
My question is, does it make sense to just look for a second hand triple crankset and replace the whole thing? However, if there's a strong reason to buy new chainrings, what do I need to look for? (I know the cranks are 110 BCD but not sure what else I need to know)