Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 45 Post(s)
Tagged: 1 Thread(s)
Quoted: 1718 Post(s)
Forged alloy stems usually have a bit of spring in them and relax open enough to slide the bar past the raised center. Don't twist it which can cause marring, instead try to use a bit of force to simply slide it. Once you clear the center bulge use finesse to work the stem past the curves by keeping the narrowed section of the stem to the inside of the curve.
If you absolutely must spread the stem a bit, try to find something wide, flat and dull, which is slightly thicker than the base of the tapered slot. Gently work it in as a wedge. For example a sandwich of two cone wrenches often works.
If you prefer to have a special tool, a forged external circlip plier like this one
can be slid into the slow and gently flex the stem open as you squeeze.
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