I had trouble with Diamondback Blanchard rims whose center channel was off center. The side with the wider shelf would seat fine but the side without would just flutter. best solution was using Continental tires which are tight. Second best solution was to put a tube in, inflate and seat, then break the long-shelf side to wiggle out the tube and the stem in. Might not be possible with little road bike tires.
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Genesis 49:16-17