Old 02-20-18, 09:55 AM
  #15  
twocicle
Clipless in Coeur d'Alene
 
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Location: Coeur d'Alene, Idaho
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Bikes: Tandems: Calfee Dragonfly S&S, Ventana ECDM mtb; Singles: Specialized Tarmac SL4 S-Works, Specialized Stumpjumper Pro, etal.

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Originally Posted by oldacura View Post
Seems like the teeth most likely to break would be on the smallest (10 tooth) cog. You might have 5 teeth at most in mesh with the chain. On the 50 tooth cog, you should have at least 20 teeth in mesh.
It is the largest 3 cogs that are a problem, but especially the AL 50T + sharp chain angle. Tandem chainstays may not be as short as on the singles that have thrashed the cassette, but it does demonstrate a certain amount of fragility. Not sure why the 2nd and 3rd cogs are having an issue as well. I would have assumed no problem as they are not AL. Anyway, obvious rule for tandems is to try avoiding AL for cogs and freehub body.
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