Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
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If you need to shorten the stem by 25-50mm, the frame is the wrong size. You current stem is long - looks like at least a 120mm, but having to something shorter than a 90mm indicates a frame size issue.
Quill stems are getting harder to find since few bikes use them these days. You need to measure your handlebar diameter to be sure that you get the right size of bar clamp. Your bars could be 25.4mm Japanese, 25.8/26.0mm or the oddball Cinelli 26.4mm.
Changing quill stems is so much more work than the new open faced stems that you might want to consider getting an adapter that allows the use of a threadless open face stem, unless the traditional look is important.