Sorry for the newbie question, but I've searched and searched and can't really find the answer I need.
I'm building a new bike from scratch for the first time in about 10 years. One of the "new" things, to me, this time around is the threadless headset.
First, I notice threadless headsets come in different stack heights. Does it matter what height I go with? Does stack height come into play with setting what used to be "stem height" in the days of threaded headsets?
Or, is "stem height" now a combination of stack height plus using headset spacers?
Or perhaps to put it another way, how do you know where to cut the fork in a threadless setup?
Sorry, but this is just a little confusing yet.
Thanks in advance!