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Old 04-10-10, 10:00 AM
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Although your crankset is 105 your BB is not. You'll find that all 105 BB spindles have female threading as seen in the Velobase pic. Velobase provide an 'overview' of components. Each manufacturer produces a variety of BB sizes to fit different applications. The Velobase example is for an Italian threaded (70) bike requiring a 115mm spindle length. Shimano probably made 10 different sized 105 BB's.
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