Originally posted by sammer
Short comment about the threadless headset. Shop guy says steerer tube comes uncut and Trek provides enough spacers that the bar and seat will be level more or less. Its not an issue as far as he is concerned.
DON'T let him do this until you're there. Temporarily fit the stem to the uncut steerer and do the rest of the fit. Get the saddle height and fore/aft position dialed in; swap stems until you have the proper extension, then measure the bar position in relation to the top of the head tube. Now you can look various stems to see whether it would be better to get that bar position via more rise/less extension or vice/versa, or some compromise.
Only after the fit is done and the stem selected should the steerer tube be cut.
I've known riders who've left the steerer uncut for sever days while dialing in their fit. Looks stupid, and it would be a particularly bad time to fall forward onto the bars, but a mistake cutting the steerer can't be undone.
If you err, err on the side of "too high."
Good luck, and enjoy your new ride!
RichC