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well i built up my voodoo with middleburn cranks 5 bolt & i run a 20\30\40 set up oh man that gearing is sooooooooooooooooooo sweet
 

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not exactly 29er specific, but the Noir and Bontrager Race X Lite carbon crank are different, the only things they share would be GXP, ring sizes and maybe arm lengths. The noirs are unidirectional carbon, Bontis ain't, plus the arm shape of the Bontragers is different than the Noir
 
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