old bike , new cranks
sorry if this has been asked but can i put on a new crank and bb on a older bike and keep everything else the same? eng threads, friction shift , 3/32 chain 6 or 7 speed freewheel. been out of the tech loop for so long . whats the difference between a new carbon crank today ? is there a difference in the width of the chainrings that wont alow me to use it with an older friction set up? just curious.