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Stiffen up. A precison machined ISIS bb interface increases rigidity. Truvativ elita cranks feature Forged 1-piece AL-6061-T6 construction, Anodized chainrings with CNC relief and ramped/pinned shift assists, 9/10 speed compatibility and ISIS crank/bb interface. Use 108 ISIS BB spindle. 635g Specify Size 170mm, 172mm or 175mm. Specify Color Black or Silver