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Technical FAQ: Installing Campagnolo cassettes

This is the second way a Campy cog may be incorrectly aligned on a Mavic freehub. The cog has been rotated clockwise approximately 150 degrees around the freehub body from the correct position. Again, only the narrow stepped tab (under the “16A” and “CAMPAGNOLO” stamps) has a rail to push against when driven forward (clockwise) by the chain. Photo: Lennard Zinn | VeloNews.com