The standard XT bottom bracket is a mainstay of modern mountain biking. This replacement set of Hollowtech II outboard bearing bottom bracket cups for Shimano XT M770 series of cranksets offers smooth, stiff performance for all Shimano cranks. Will also work for any Hollowtech II type mountain bike cranksets such as Shimano Deore or XTR. Note: Not compatible with Road type Hollowtech cranks.
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