Originally Posted by
oik01
Do you have to fix the gearing again after you install a new stem? ( I'm assuming the wires will be less tense on a shorter stem?
Unless you remove the controls from the handlebar, or otherwise disconnect the cables, you shouldn't have to 'fix' the shifting or brake cables.
A modern 'threadless' stem usually allows you to remove/replace the stem without disconnecting the shifter / brake cables.
On an older 'quill' style stem, you usually have to remove the controls and grips from one side of the bars to get the stem off. Once you disconnect a cable, you will have to check your adjustments when you hook it back up.