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High-end mid sized bb kit. The spacer will increase the longevity of the bearings as well as help with crank flips if thats your thing, so yeah, don't leave it out...
Material-Alloy CNC Cones, Sealed Bearing
Size-For Mid-BB Frames
Features-High Quality Sealed BearingsIncludes Cones & Spacers To Adjust Chain-Lines On 68, 73 & 74mm Bb Shells