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· Old man on a bike
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Hollowtech isn't enough information, they made square taper versions as well as splined (and the newer external types are Hollowtech also, refers to the construction of the arm). Find the model number of the crank or take the cranks off and it'll be obvious. Once you know the specific crank model, you can determine the spindle length, too. Try using this once you find your model number: http://sheldonbrown.com/bbsize.html
 
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