So my old Raleigh fixed conversion has suddenly gone and got stiff steering. I removed and reinserted the stem in order to make sure that the stem hadn't just got kind of stuck itself, and that didn't do anything. Anyone want to offer an educated guess or a reasonable list of tests to go through to determine the problem. Can this happen from the onset of freezing temperatures? The stem itself is well-greased and fits fine. It's the original stem, so there isn't an issue of size compatibility. Do headsets just go and get tight one day, or did this just happen so slowly I didn't notice it?