Wheels Manufacturing's BB30 Outboard bottom bracket will give you all of the same benefits as the well-loved Outboard style bottom bracketss. The two machined aluminum cups thread together ensuring the bottom bracket remains stable in the frame, increasing bearing life, and simplifying maintenance. This means no more creaking, smoother operation, longer bearing life, and really quick bearing replacement Specifically designed for installing 24mm spindle diameter cranks (Shimano, FSA, Etc.) in BB30 frames without the need for any adapters. Features: Converts BB30 shells (42mm ID- 68mm road/73mm mountain) to accept most 24mm or 24/22mm spindle cranks For 24mm (Shimano, FSA, Race Face, etc) for installation into BB30 frames without the need for adapters Includes anodized aluminum cups with Enduro sealed bearings Base: Enduro ABEC 3 sealed bearings Specifications: Frame Interface: BB30, Specialized Alloy OSBB Spindle Interface: 24mm (Shimano Hollowtech II, FSA MegaExo, RaceFace EXI) Bottom Bracket Shell ID: PF42 Shell Width: 68mm, 73mm Material: Aluminum Cups, Enduro ABEC-3 Bearings Color: Black Weight: 153g