Converting from 53/39 50/34 cheaply
I currently have a 105 53/39 crankset. I have quickly realised I need a 50/34. Originally I was going to buy new chainrings but I can't find both chainrings sold together. Individually they are a ripoff for a piece of metal. I've seen some cheap FSA cranks but they are for BB30 and I have hollowtech II. Any suggestions on what to do ???