Shimano Dura Ace 7900 Bottom Bracket Cup Set

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In spite of what most people think, Bottom Brackets do eventually where out. A great way to tell if yours is worn and needs replacing is to pull your crank off and try and turn the bearings with your fingers. The absence of leverage will enable you to feel if there's any friction or stiction in the bearings. If so, order up a new one and throw it in. The 7900 BB's are constructed of aluminum and feature super round stainless steel balls for ultra smooth rolling.