Zipp Speed Weaponry Vuma BB30 Kit allows the installation of VumaQuad or VumaChrono Cranks on BB30 Cranks. Contained within the kit are C-clips, Spacers, Wavy Washer, BB30 spacers and Silicone Nitride Ceramic Cartridge Bearings. BB Shell Width: 68 Spindle Interface Type: Zipp Vuma Spindle Length: BB Thread Type: BB30