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Technical FAQ: Installing Campagnolo cassettes

This is the third way a Campy cog can be incorrectly aligned on a Mavic freehub. The cog has been rotated clockwise approximately 240 degrees around the freehub from the correct position. Yet again, only the narrow stepped tab (under the “16A” and “CAMPAGNOLO” stamps) has a rail to push against. It was not designed to take such stress. Photo: Lennard Zinn | VeloNews.com