You are probably trying to use the V2 (version 2) Octalink BB. The V2's include XT, LX and Deore. The Tarantula cranks use the V1 (version 1) Octalink BB spline pattern which is found on the XTR, Dura Ace and Ultegra. Due to the narrower chain line allowed by the 2x9 (vs 3x9), Cannondale usually spec'd this crank with the Ultegra BB 68x109.5. Most people shied away from the Dura Ace version because of the lockring adjustment feature, but it was rebuildable.
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