Originally Posted by
RubeRad
? I have a GB stem on one of a couple bikes with threaded headsets, and as far as I recall, it has an expansion bolt driven by a diagonal cut just like any other
I've not seen every GB stem, but don't recall ever having seen one with a wedge rather than a cyclindrical expansion nut. Here are a couple (Raleigh used them on a lot of bikes). Two different styles. The bog standard was on a Super Course, the one labeled "forged" on a late 70s Grand Prix.
