hi- can someone settle this once and for all for me? it is my understanding that the only difference between 9 and 10 speed cranks is the thickness of the chainrings. 10 speed has thinner ones that help it to shift easier. however, as i begin looking for a 10 speed crankset, i see that 10 speed cranks are advertised as specific, as if there is a difference with the actual cranks, besides price. Can anyone tell me if this is true, or are they simply just different because of the thickness of the chainrings?
My reason in asking this is if i keep my old cranks, can i just add new chainrings, or do i need a new crankset? thanks so much in advance!