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From my experiences "Magic Gear " is somewhat of an urban legend. Depends on chain and sprocket wear etc, It was supposed to be 32/20 on the regular air 9 Was pretty hit and miss though. I ended up with an one 9 "much happier"
 

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supposedly there is a company that makes a compatible essentric called "beer industries" Im not gonna put it on mine though. My friend is running a tensioner on his, and like we thought, it sucks. Supposedly the YES tensioner works well on it. I am just gonna run a air 9 carbon for my single and call it a day. .
 

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I run the Beer Components EBB on my Cannondale. Top quality, does not slip, and it quiet. I cleaned the shell with alcohol, installed the BB dry, and 3 months later it is still quiet.
 
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