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Technical FAQ: Installing Campagnolo cassettes

  • By Lennard Zinn
  • Published Aug. 25, 2014
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This is the orientation Larry’s cog was probably in when it broke, with the chain tooth just counterclockwise from the “11,” having just passed 12-o’clock. You can see that the leading edge of the shift relief area (see arrows) on the cog exacerbates the problem by giving the cog a perfect breakage line along which to initiate the crack, once the chain had skipped off of the low, shift-aiding tooth and was pulling hard on the next four teeth.

The only point of engagement with the freehub body, due to improper installation, was the narrow stepped tab on the tang with the “16A” and “CAMPAGNOLO” stamps. This was right behind the thinned shift relief area. The entire cog was unsupported ahead of that tang, and the chain tore it in half at the easiest place it could find, the leading edge of the shift relief area. Again, a worn (elongated) chain would have made this incident more likely by not engaging the teeth behind (counterclockwise from) the low, shift-aiding tooth. Photo: Lennard Zinn | VeloNews.com

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